Acclimatization to altitude ________.
A. decreases ventilation
B. stimulates increased blood cell synthesis
C. increases the affinity of hemoglobin for oxygen
D. All of the choices are correct.
Answer: B
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Which of the choices below explains why the arterioles are known as resistance vessels?
A) The contraction and relaxation of the smooth muscle in their walls can change their diameter. B) They contain a large quantity of elastic tissue. C) They distribute blood to various parts of the body. D) Their prime function is the exchange of nutrients and wastes between the blood and tissue cells.
Design a concept map for the types of cell junctions and the proteins that compose them.
What will be an ideal response?
Which of the following statements regarding the fatty acid tails of phospholipids is FALSE?
a. Phospholipids with unsaturated tails make the bilayer more fluid because the tails contain fewer hydrogens and thus form fewer hydrogen bonds with each other. b. Saturated phospholipids' tails pack more tightly against each other than do unsaturated tails. c. Most membrane phospholipids have one fully saturated tail. d. Phospholipid tails in a membrane can interact with each other via van der Waals interactions. e. Fatty acid tails vary in length.
Decreased sensitivity to a continued stimulus is called ________.
A. conduction B. translation C. phantom pain D. projection E. adaptation