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- Diapositiva: 1
- Hey, man. I'm having trouble remembering last week's lesson.
- The Circulatory System? Why don't we walk and talk as I help you?
- Hey, man. I've been having some trouble remembering last week's science lesson.
- About the circulatory system? Need a refresher? Why don't we walk and talk?
- Diapositiva: 2
- First, oxygen enters through your mouth or nose, and goes through your larynx, pharynx, and your trachea.
- Well.. I forgot how the entire process went.
- Can you explain from the beginning?
- Don't worry! I'm here to help.
- Then, the oxygen enters the bronchi, which branches off into bronchioles, which end at an alveolus, a small sac of air.
- So first, oxygen enters your throat via your mouth or nose..
- Then enters your pharynx, larynx, and into your bronchus.
- There, gas exchange will happen. Gas exchange is the removal of carbon dioxide from the blood, and absorption of oxygen into the blood.
- Diapositiva: 3
- There, the oxygenated blood flows from capillaries to pulmonary veins, which lead to the heart.
- Then, the bronchioles end at the alveoli, where gas exchange happens.
- The oxygen molecules need to shrink, to fit into bronchi's branches, the bronchioles.
- The oxygenated blood will go to the left atrium, then pass through the left ventricle.
- The oxygenated blood will then be pumped through the aorta, which travels to other arteries.
- The blood will then go through capillaries and give oxygen to the mitochondria, which produces ATP.
- Diapositiva: 4
- The oxygenated blood passes through a pulmonary vein that leads to the heart's left atrium.
- All that's left is deoxygenated blood, which contains CO2, which our body needs to get rid of.
- The deoxygenated blood will travel through the capillaries to the venules, which connect to larger veins that connect to the vena cavae.
- Then the left atrium will open, pumping the blood into the left ventricle, which will contract and force the blood into the aorta.
- The blood will flow through arteries, and go to capillaries to give oxygen to the capillaries to deliver to the body cells.
- The venae cavae connect to the heart, where the blood will flow into the right atrium, then through the right ventricle.
- The oxygen will be given to the mitochondria, which will turn into ATP.
- The deoxygenated blood is then forced from the right ventricle into the pulmonary arteries, into more capillaries, where the CO2 will be removed and replaced with oxygen.
- Diapositiva: 5
- The CO2 is then removed from the alveolus, exits the bronchioles, bronchi, trachea and through the mouth or nose.
- CO2 goes to venules, which connect to the venae cavae, which carries the deoxygenated blood to the heart.
- The deoxygenated blood is put in the right atrium, passes through the right ventricle, and is pumped into the lungs.
- Then, the CO2 is expelled from the body through exhalation.
- Diapositiva: 6
- Dude, thanks! I understand now!
- Yeah! Thanks, man!
- Understood all that?
- Anytime, man.
- Diapositiva: 0
- The now oxygen-poor blood has CO2, which our bodies need to get rid of.
- Once oxygen is distributed, all that remains is carbon dioxide, which will go to the lungs.
- Gas exchange, put simply, is the process of removing carbon dioxide and waste, and the absorption of oxygen into the blood.
- I see.
- I see.
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