The Human Heart
Your heart is a muscular organ that pumps blood to your body. Your heart is at the center of your circulatory system. This system consists of a network of blood vessels, such as arteries, veins, and capillaries. These blood vessels carry blood to and from all areas of your body.
An electrical system controls your heart and uses electrical signals to contract the heart's walls. When the walls contract, blood is pumped into your circulatory system. Your heart is vital to your health and nearly everything that goes on in your body. Without the heart's pumping action, blood can't move throughout your body.
Your blood carries the oxygen and nutrients that your organs need to work well. Blood also carries carbon dioxide (a waste product) to your lungs so you can breathe it out.
A healthy heart supplies your body with the right amount of blood at the rate needed to work well. If disease or injury weakens your heart, your body's organs won't receive enough blood to work normally.
The heart is one of the most important organs in the entire human body. It is really nothing more than a pump, composed of muscle which pumps blood throughout the body, beating approximately 72 times per minute of our lives. The heart pumps the blood, which carries all the vital materials which help our bodies function and removes the waste products that we do not need. For example, the brain requires oxygen and glucose, which, if not received continuously, will cause it to loose consciousness.
The heart is essentially a muscle(a little larger than the fist). Like any other muscle in the human body, it contracts and expands. Unlike skeletal muscles, however, the heart works on the "All -or-Nothing Law". That is, each time the heart contracts it does so with all its force. In skeletal muscles, the principle of "gradation" is present. The pumping of the heart is called the Cardiac Cycle, which occurs about 72 times per minute. This means that each cycle lasts about eight-tenths of a second. During this cycle the entire heart actually rests for about four-tenths of a second.
The walls of the heart are made up of three layers, while the cavity is divided into four parts. There are two upper chambers, called the right and left atria, and two lower chambers, called the right and left ventricles. The Right Atrium, as it is called, receives blood from the upper and lower body through the superior vena cava and the inferior vena cava, respectively, and from the heart muscle itself through the coronary sinus. The right atrium is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right atrioventicular valve(tricuspid), which only allows the blood to flow from the atria into the ventricle, but not in the reverse direction. The right ventricle pumps the blood to the lungs to be reoxygenated. The left atrium receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium, but has thicker walls. The valve between the left atrium and the left ventricle, the left atrioventicular valve(bicuspid), is smaller than the tricuspid. It opens into the left ventricle and again is a one way valve. The left ventricle pumps the blood throughout the body. It is the Aorta, the largest artery in the body, which originates from the left ventricle.
The Heart works as a pump moving blood around in our bodies to nourish every cell. Used blood, that is blood that has already been to the cells and has given up its nutrients to them, is drawn from the body by the right half of the heart, and then sent to the lungs to be reoxygenated. Blood that has been reoxygenated by the lungs is drawn into the left side of the heart and then pumped into the blood stream. It is the atria that draw the blood from the lungs and body, and the ventricles that pump it to the lungs and body. The output of each ventricle per beat is about 70 ml, or about 2 tablespoons. In a trained athlete this amount is about double. With the average heart rate of 72 beats per minute the heart will pump about 5 litres per ventricle, or about 10 litres total per minute. This is called the cardiac output. In a trained athlete the total cardiac output is about 20 litres. If we multiply the normal, non-athlete output by the average age of 70 years, we see that the cardiac output of the average human heart over a life time would be about 1 million litres, or about 250,000 gallons(US).
Most heart attacks are caused by a blood clot that blocks one of the coronary arteries. The coronary arteries bring blood and oxygen to the heart. If the blood flow is blocked, the heart is starved of oxygen and heart cells die. A plaque can build up in the walls of your coronary arteries. This plaque is made up of cholesterol and other cells. A heart attack can occur as a result of plaque buildup. The plaque can develop cracks or tears. Blood platelets stick to these tears and form a blood clot. A heart attack can occur if this blood clot completely blocks oxygen-rich blood from flowing to the heart. This is the most common cause of heart attacks. The slow buildup of plaque may almost block one of your coronary arteries. A heart attack may occur if not enough oxygen-rich blood can flow through this blockage. This is more likely to happen when your body is stressed (for example, by a serious illness). The cause of heart attacks is not always known.
Heart attacks may occur:
When you are resting or asleepAfter a sudden increase in physical activity
When you are active outside in cold weather
After sudden, severe emotional or physical stress, including an illness
The pain can be severe or mild. It can feel like:
A tight band around the chest
Something heavy sitting on your chest
Squeezing or heavy pressure
The pain usually lasts longer than 20 minutes. Rest and a medicine called nitroglycerin may not completely relieve the pain of a heart attack. Symptoms may also go away and come back.
Other symptoms of a heart attack include:
Nausea or vomiting
Shortness of breath
Some people (the elderly, people with diabetes, and women) may have little or no chest pain. Or, they may have unusual symptoms (shortness of breath, fatigue, and weakness). A "silent heart attack" is a heart attack with no symptoms.
Click here to a dropbox link of my presentation (pdf format)
Here's a link to my website!
What were you surprised about? That I'm bad at detecting sarcasm in spanish since normally i can easily find it in someone's voice in english.
- Doing/ being what you want.
- to make any choice.
- Ability to do, have, be with out consequences.
- A right that everyone should have.
- Pursuing goals.
- expressing yourself with out being judged.
- Form of rebellion.
- A type in Liberation.
People create art to express themselves, wen ever someone doesn't want to express themselves to anyone verbally. they put it in to art. Advertisement, express motion, getting things off their chest.
2) When is art powerful?
To release, let go. Say things that you can't say with words. Speaks to you in a way that words can't. Descriptive, when expressing something powerful. When you have a strong enough meaning behind it. When it inspires you.
To view my video go there(:
I think this quote is saying that your misery will always leave a mark as a thumbprint/mak for others to see. I also think its saying when people have misery or drama, it stays with them and sometimes they it in and don't tell anyone and sometimes that thumbprint it for others to see.
This final portfolio is about my general understandings from this school year about History assignments and mainly English.
In the beginning of the school year, I wasn't aware of the different writing techniques and the different poetry techniques. In English, my writing techniques got better and I learned different general understandings about different topics. During English I had a lot of experiences with interesting and helpful people (Leah Stein Dance Company, Philadelphia Young Playwrights etc.) For example the poetry wiki, we had to write different styles of poetry, which made me think out side of the box. I also never knew that their was so many different poetry styles to do, for example The Ode to Teachers, that I wrote, I got to express myself about the type of teachers that I like and dislike. As for Persepolis and the book Night, I began to understand the general understandings about how teenage kids coped with living while the Iranian war/ Concentration camps and war, happening in their own backyard. This English year made me more open to different writing tecniques. The beginning of the year, I was expecting English class to be a regular English class, but as the year progressed, it became a unique English class, with hands on assignments.
Hope is what makes you want to survive through the hard times…
Hope is what keep people going through hard times because it is stronger then fear. People rely on hope to get them through their darkest moments. For example, in the book Things Fall Apart. I wrote a chapter 26. The previous chapter was when the main character Okonkwo hung himself, mainly because his life was turning upside down and he couldn't handle it anymore. One of the lines of chapter 26 says” I’ve been through a lot, these past eight years. When I returned back from exile, I was determined to be the same, powerful person I was 7 years ago. When I came back I was striving to be powerful, but when I was sent to jail, and beat. I knew that my time was up and if I kept on striving for something that would take so long to get, that throughout those years the Commissioners would become stronger and take over." The reason why I wrote that for chapter 26, because that's what Okonkwo would've said, Okonkwo always had hope to be the person he was before, while in exile. When Okonkwo left the exile, The Commissioners took over and everyone was following them. The rules changed and Okonkwo tried to go against them but it made everything even worse. Okonkwo was the kind of person who had hope and a plan, but if his plan didn't start to work, he would eventually give up and that's what he did.
In the book Persepolis, Marjane, was growing up during the Iran war, she had to live in another country because of all the harm and damage the Iranian war was doing. During the book, Marjane would always end up giving hope, until one day she got her act together and she had hope that she could get through hard times. Although she went through depression, and the Iranian was still going on, she never gave up hope and that one-day she would be happy with out a husband. In the book Night, the war was going on and all Jews had to be sent to Concentration Camps, Elie, who is the main character went through a lot during the past years he was in the concentration camp with his dad. He was separated form his mother and sister. Him and his dad always had hope, that hope didn't get them killed for years. Elie still kept hope even when his father was slowly dying. "Elie never stopped fighting for him and his father. Also during the book Elie was powerless, for example when the Germans were beating him, he couldn't do anything but take the beating, and keep on being fearless." When you don't have hope in yourself, you let yourself go and things fall apart. Hope is what makes you want strive for what you want.
Art is the doorway to express yourself. Art- the expression of creative skill and imagination.
Art is something you can do with out speaking, for example the interpretive dances called Art In the Open, when we had to interact with each other with out any music and just using the area around us, to make noises etc. Art in the Open, made a doorway to another way to express you, and just go with the flow, with out thinking, which is what Leah Stein and her dance company taught us, to not think when doing the interpretive dancing, just do. "Not all art has to have a story, which is what I learned through-out this experience. For example the interpretive dancing, we weren't supposed to make a story but to just use our surroundings and interact with each other. What makes art powerful is that you don't think about what you're doing you just do it." When being apart of Art in The Open, we were split up and groups, and had to perform our interpretive dancing at a location that we got to pick. It was a great experience and taught me a lot about using your surroundings to make art.
When writing the play, I got to express myself, because I wanted to make my Play just a little bit romantic and I got to make the characters any way I wanted them to be. When writing most plays it's like a dream that you put on to paper, or a situation that you make in to a story. When reading the book Passing, we had to make artwork about insight in to some of the issues related to the book. In the book passing the main characters are Irene and Clare. Clare is passing, because even though she is black, she can pass for white, and back in that time, people judged you based off of your skin color. Irene on the other hand wasn't exactly passing.
To bring awareness to my breast cancer I made a PSA informing people where they can go to get a monogram and that you're never to young to get a mammogram. this is positive because less women will get diagnosed when its at a serous stage and less people will have to worry about such a bad thing like breast cancer.
If you would like to see some information and statistics on breast cancer you can look at my first and second blog.
I think that it's a great idea for women to get mammograms at a younger age and more often because then there won't be as many serious cases and less people will die from it.
so far I have tried to show people the importance of getting a mammogram and how devastating breast cancer is, in some cases the breast has to be removed because the cancer has spread so far
I would like to acknowledge ms dunn for helping me with my blog and brainstorm what to do for my creative piece.
One thing that I can say that I truly understand is you have to go through a struggle in order to succeed. In March, we were assigned to read a book by a Haitian author named Edwidge Danticat. The book was called Create Dangerously. This book was a collection of essays about her life and Haitian issues. There was one essay in particular that really grasped my opinion. This essay was called “I Speak Out.” It was about another Haitian lady named Alérte Bélance that was mutilated by the Macout (the Haitian army), but surprisingly survived. People found her story so interesting that they flew her to the United States so she was able to share her story to other people. In my forum post responding to this I wrote “While reading “Speak Out” I was appalled by the actual reality of the things that were taking place in Haiti.” You can view my forum at this link.
In Mr. Block’s class we also did a very interesting project with garage band. We had to do a podcast interviewing someone about the boundaries they had crossed in their life. I interviewed my uncle who is a recovering addict. He has had a rough past with crack cocaine. He was on crack cocaine for about 22 years of his whole life and miraculously is clean today and has been clean for more that four years. During the podcast I expressed that this addiction has had negatively and positively affected his life. In the podcast I said, “Using crack cocaine was definitely his valley. Laughter family, and crossing the boundary of not using drugs was his peak.” You can view my podcast at this link.
Throughout the school year, I have learned that art can be interpreted in many ways; you just have to be creative enough to understand it. As the end of the school year was approaching, Mr. Block introduced us to a new unit in English class. He introduced us to the poetry unit. As soon as I heard poetry I started to have a sissy fit because I always thought that my mind was not physically able to think like a poet. My exact words in one of my English journal entries were, “I am not no Maya Angelou.” I was definitely not looking forward to the couple of weeks we were going to be in this unit. However, when I started to write my first poem “My Baby Love” I was surprised that I could be as creative as I appeared to be. When I wrote my introduction to my wiki space account, I wrote something that reflected my whole experience in the beginning. I said, “I stepped into this whole poetry unit blinded by the complexity I thought poetry had.” You can view my poetry page at this link.
I was assigned a book to read in about February called Passing by Nella Larsen. This book was about an African American woman named Clare Kendry who is passing for a white woman back in the 1960s. She is living a dangerous life because her husband who she has many ties to doesn’t know she is African American. By the end of the book, Clare ends up falling out of a window and there was a mystery to how she fell out. Mr. Block assigned us to create an artistic project about the book. My friend and I decided to work together on this project and decided to do an iMovie. In my forum post about the project described my entire process while doing the project. I said in my forum post, “We did two skits on our interpretation of how it would look on the news when Clare died.” This is the link to see my video
This year has definitely been a great one. I don’t regret anything I have done this school year because all of the mistakes I have made I have learned from them. I am so very grateful to have had a teacher like Mr. Block for History and English class. This school year would not have been the same without him. I hope the rest of my years in high school will be as self learning as this year was.