Some plaques lead to blockages/clots. The cells below the clot will not get any oxygen. In the heart this leads to dead heart tissue. Here is a Khan Video about plaques, clots, and heart attack.
Showing posts with label khan academy. Show all posts
Showing posts with label khan academy. Show all posts
Monday, January 21, 2013
Diseases in the Circulatory System
Today we also talked about diseases and problems affecting the circulatory system. One of the main problems are blockages in small arteries. These plaques (atherosclerosis)are formed usually with fat or cholesterol. The fat builds up due to small microtears forming in the vessels. These also cause increased blood pressure. These microtears build up fat, which in turn traps more fat resulting in a positive feedback loop. In the heart, this can cause Heart Disease. Microtears form when blood pressure is too high from dehydrated blood (not enough water), high salt, and other causes.
Some plaques lead to blockages/clots. The cells below the clot will not get any oxygen. In the heart this leads to dead heart tissue. Here is a Khan Video about plaques, clots, and heart attack.
Some plaques lead to blockages/clots. The cells below the clot will not get any oxygen. In the heart this leads to dead heart tissue. Here is a Khan Video about plaques, clots, and heart attack.
Finishing up the circulatory system.
Homework: Create/Design your own experiment to test changes in the circulatory system using the tools we used for our vital signs lab.
Saturday and Monday we finished going over the circulatory system. We traced a blood cell from the nose and back again. Can you do this? Don't forget the different circuits - Pulmonary and Systemic. Could you identify what circuit it is by the blood concentrations?
We reviewed the differences between Arteries and Veins. Here is the Kahn Academy, along with one more, video for you to review.
When talking about capillaries, we said they were 'leaky' and by osmosis (what is this?) Plasma (water) moves out due to higher BP, and the lower concentration of water in the interstitial fluid, at the arteriole end of the capillary. This causes the blood to be 'sludgy.' The lower BP and decreased concentration within the capillary near the venuole end means, water moves back in (about 85%- what happens to the other 15%?). Large molecules/cells don't move out of the capillary but some small proteins, hormones and other molecules do. Why?
We also went over Systole and Diastole again. Can you tell the difference? Here is the video we watched in class
Saturday and Monday we finished going over the circulatory system. We traced a blood cell from the nose and back again. Can you do this? Don't forget the different circuits - Pulmonary and Systemic. Could you identify what circuit it is by the blood concentrations?
We reviewed the differences between Arteries and Veins. Here is the Kahn Academy, along with one more, video for you to review.
When talking about capillaries, we said they were 'leaky' and by osmosis (what is this?) Plasma (water) moves out due to higher BP, and the lower concentration of water in the interstitial fluid, at the arteriole end of the capillary. This causes the blood to be 'sludgy.' The lower BP and decreased concentration within the capillary near the venuole end means, water moves back in (about 85%- what happens to the other 15%?). Large molecules/cells don't move out of the capillary but some small proteins, hormones and other molecules do. Why?
We also went over Systole and Diastole again. Can you tell the difference? Here is the video we watched in class
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