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Copy of The Heart
Transcript of Copy of The Heart
By: Sarah Shin Margolles Period 8
About the System
There are 3 major functions to this system: first, the system delivers oxygen around the body. Secondly, the system delivers nutrients and hormones around the body. Third, and most important, the system protects the body by sending white-blood cells, hormones, etc. around the body to fight foreign microbes and such.
The vessels carry blood away & to the heart. The arteries carry blood throughout the body, and the veins take blood to the heart for the cycle to begin again.
Did you know: the average heart beats about 108,000 times a day? That's about 35 million times in a year, and more than 2.5 billion times in an average life span.
A Heart Diagram
The heart is the key organ in this system.
The heart is divided into 4 different chambers; the left and right atrium, and the left and right ventricle.
An average heart will weigh about 9~12 ounces, and is about the size of a fist.
The heart is connected to the lungs by the pulmonary veins, where the blood that already traveled through your body gets oxygenated once again.
The heart is made up of epicardium, endocardium and myocardium. These tissues make up and protect the heart.
The arteries carry blood from the heart and send it around the body, delivering oxygen.
The arteries are supposedly red, due to the redness caused in the blood by the oxygen.
The arteries have three layers: the intima, the inner layer lined by a smooth tissue called endothelium, the media, the layer of muscle that helps the artery endure high pressures from the heart, and the aventitia, connective tissue anchor to nearby tissue.
Did you know; the largest artery in the entire system is the aorta?
The veins are the vessels that transport de-oxygenated blood back to the heart to be oxygenated once again.
The veins carry dark red blood that does not have much oxygen.
Veins do not have a thick wall like the arteries, because the blood is under less pressure.
The veins also have 3 layers, the intima has the same lining of endothelium, next the veins have the media, which is composed of elastic fibers and smooth muscle. Lastly, the aventitia connects the vein to nearby tissue.
The capillaries are the smallest vessels in the system, and there is a lot of them.
Capillaries mostly reach down to the tips of your fingers and toes.
Capillaries also carry waste-rich blood back to the heart.
Capillaries are one epilthelial cell thick, so the red blood cells can only travel in a single file line.
The capillaries are thinner than an average person's hair.
Capillaries are also responsible for the body's release of heat. For example, if you hold your hand(in hot water), your hand turns red or pinkish for that reason.
Coronary Artery Disease
Coronary artery disease is a cardiac disease where your coronary arteries(one of the major arteries in the system), become damaged or infected. Cholesterol-containing deposits(plaque) are usually blamed for the cause of the disease.
When the plaque builds up, the artery narrows, causing less blood to travel to the heart. The less amount received blood can cause chest pain, or angina, shortness of breath, nausea, and etc.
Coronary artery disease is caused by a condition called atherosclerosis, which build up plaque in the coronary arteries(the arteries on the heart).
Ways to Prevent Coronary Artery Disease
Here are some ways to prevent CAD:
Maintaining a healthy diet
Working out and exercising
Try not to higher blood pressure and lower stress.
Preventing CAD can lead to a longer life, and a more fit and healthy life.
Video about the System
The Cardiovascular System
The cardiovascular system includes the heart, blood and the blood vessels(duh!), but there is a bit more related to the system.
What we know, the waste-filled and de-oxygenated blood travels through the body, back to the heart to be re-oxygenated. That's what we think.
Now, this is when the kidneys come in; the blood is traveling through the veins, it enters the kidneys, not the heart.
Some people think that the heart is the one cleaning the blood again. That is not true. The kidneys filter the blood of the waste in the blood.
As seen in the picture at the left, there are veins and arteries in the kidneys. That's where the blood filters through the kidney and out to the heart.
Cardiovascular System Quiz
1. What does the heart do?
2. How many chambers is the heart divided into?
3. How many layers do the arteries and veins have?
4. What is the largest artery in the system?
5. What is coronary artery disease and what does it do to the body?
6. How can coronary artery disease be prevented?
1. The heart pumps blood, oxygen, nutrients and hormones around the body.
2. Four chambers, the left and right atrium and the left and right ventricle.
3. 3 layers total
4. The aorta
5. Coronary artery disease is known as heart disease and it blocks the coronary arteries and can cause heart attack, stroke, etc.
6. Coronary artery disease can be prevented by living a healthy lifestyle, exercising, quitting smoking if the victim smokes, and trying not to higher blood pressure and stress.
The heart produces enough energy daily to drive a truck 20 miles.
Researchers found that owning a cat can reduce the risk of heart attack and strokes by more than a half.
Multivitamins can increase the risk of cancer and heart disease.
Your heartbeat mimics the beat of the music a person is listening to.
Eating dark chocolate can reduce the risk of heart disease
A women's heart beats faster than a man's heart