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THE CARDIOVASCULAR SYSTEM
Transcript of THE CARDIOVASCULAR SYSTEM
By Rylee Collins and Emma Tierney
Prior knowledge questions
(raise your hand!)
1. What organs make up the cardiovascular system?
2. What does your heart do, exactly?
3. What are the three types of tubes that your blood passes through?
is the heart
of the cardiovascular system.
It is made up of muscle and it pumps the blood throughout the body. It takes the blood without oxygen to the lungs where it will recieve more oxygen. The heart is made up of four chambers: the right atrium, left atrium, right ventricle and the left ventricle
The arteries carry blood from your heart to all of your body. First, they branch into smaller arteries, then arterioles, a smaller version of arteries, and then capillaries. Arteries can contract and expand to raise and lower blood pressure as needed. The arteries come from the aorta, a large part of the heart that pumps out oxygen-rich blood. The arteries are much stronger than the veins, due to the fact that the arteries carry blood at a much higher pressure than the veins.
The veins in your body are just like the arteries, except not as strong. They carry the oxygen-poor blood at a lower pressure than your arteries to the heart to be pumped to the lungs. Since this involves going up, the veins have several valves along the way that open and close, giving the blood a sort of foothold as it travels.
And then back to the heart!
The capillaries connect the veins and the arteries. Capillaries extract oxygen and deposit carbon dioxide into the blood, then sends the blood into the veins to be brought back to the heart. These are the smallest of all the vessels, only one blood cell wide.
Red Blood Cells
What would happen if your cardiovascular system stopped?
Sure, you can be brain-dead and still live, but if your cardiovascular system stops working, you’ll die almost instantly. Your respiratory system will stop working because you cannot get rid of the CO2, and you cannot distribute oxygen throughout your body. You would suffer serious brain damage due to the lack of oxygen in your brain, and that’s irreversible. Because it cuts off circulation to your limbs, they would die and require amputation.
The red blood cells travel through the veins while carrying oxygen particles. Red blood cells are made up of a protein called Hemoglobin that contains iron, causing the cells to appear red. However, when they travel back to the heart, they appear blue due to lack of oxygen. When you see the blue lines on your arms, those are veins. The arteries blend into the red tones in your skin, making them invisible.
White Blood Cells
The white blood cells travel throughout the veins. Their job is to stop the bad germs before they can cause infection or diseases. To get rid of the nasty bacteria they can either produce a kind of antibiotic to kill the germ or surround it and devour it.
The platelets travel through the veins like the blood cells. The platelets job is whenever the body loses blood or gets a cut to clot the opening with a scab. To create the scab they produce the mineral calcium, vitamin K and a type of protein called fibrinogen. Without platelets a simple paper cut would make us die do to blood loss. There is a very small number of people that have Hemophilia, a condition that causes your blood to be unable to clot. They must be extremely careful not to get cut, or else they could die.
How does the cardiovascular system work with the other systems of your body?
Your cardiovascular system works with many other systems of your body. The bones in the skeletal system produce blood cells for the cardiovascular system to circulate. The respiratory system relies on your cardiovascular system to use the oxygen and return the waste CO2. The endocrine system also transports hormones through the blood to its receptors.
Plasma is a very important component of blood. It is a 92% water, yellowish, sticky solution that travels through the veins and keeps blood a liquid.
You may want to take notes-
some of this will be on the quiz!
If you ever feel tired or overworked, remember that your heart is always working for you, even when you're sleeping... And it doesn't complain!
Before you go...
I work 24/7 for you!
What would happen if your cardiovascular system stopped?
Sure, you can be brain-dead and still live, but if your cardiovascular system stops working, you’ll die almost instantly. First, you would go in to shock and be unable to move. Soon, your respiratory system will stop working because you cannot get rid of the carbon dioxide, and you cannot distribute oxygen throughout your body. You would suffer serious brain damage due to the lack of oxygen, and that’s irreversible. Because it cuts off circulation to your limbs, they would die and require amputation. Not fun.
How does all this have to do with homeostasis?
The cardiovascular system is a HUGE part of maintaining homeostasis. When you are more active, your muscles are moving more, meaning they need more oxygen. You breathe faster, which then causes your heart to beat faster to maintain a good oxygen level in your body.
= this will be on the quiz!