How could lipids lead to a myocardial infarction?
What will be an ideal response?
The fat, arriving via low-density lipoproteins (LDLs), will be deposited on the arterial lining, which stimulates inflammation. The smooth muscle layer of the arteries will enlarge in response to the inflammatory (or defense) cells, and that will result in thickening of the arterial walls. Some defensive cells will take up more lipids, and fatty streaks will form on the arterial wall. These processes produce plaques, which can narrow the passageway within the artery, reducing blood flow. The plaque could rupture, and a blood clot may form. At that point, the artery may be so narrow that the cells it serves will no longer get the oxygen they need and then die. When this happens in the heart, it can cause heart attack.
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Osmosis can only occur if water travels through the
A. cell wall. B. semi-permeable membrane. C. vacuole. D. ER. E. cytoskeleton.
After fertilization, the zygote grows through a series of cell divisions called cleavage. The embryo does not grow in size although the cell number is increasing. How does this happen?
What will be an ideal response?
A large increase in exercise (say hiking for 20 miles a day for a week) requires _______________.
a. an increase in oxygen delivery to the muscles b. an increase in nutrient delivery to the muscles c. an increase in ATP levels in the muscles d. a and b are correct e. a, b, and c are correct
Compared to small cells, large cells have more trouble
A) dividing. B) producing daughter cells. C) storing needed materials and waste products. D) moving needed materials in and waste products out.