What stimulus causes the release of atrial natriuretic hormone from the atria of the heart?
A. Increased blood sodium levels
B. Decreased blood volume entering the atria
C. Increased blood volume entering the atria
D. Decreased blood pressure
Answer: C
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Answer the following statement(s) true (T) or false (F)
1. Women with morning sickness tend to prefer spicy and pungent foods. 2. Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies. 3. A slow block is the mechanism that prevents fertilization of another egg when one is already pregnant. 4. Cleavage results in daughter cells containing half the number of chromosomes of the parent cell. 5. During implantation, the embryoblast undergoes gastrulation.
Answer the following questions true (T) or false (F)
1. During the absolute refractory period, production of an additional action potential is not possible no matter how strong the stimulus. 2. Saltatory conduction is slow due to the presence of insulating myelin around an axon. 3. Conduction speed of a nerve impulse is influenced by the diameter of the axon and the presence or absence of a myelin sheath.
Which of the following is NOT a structural category of synovial joints?
a) Planar b) Hinge c) Condyloid d) Suture e) Saddle
A graded potential is one that
A. is all or none (always the same intensity). B. travels the length of the nerve fiber (is long-distance). C. varies in size depending on the magnitude of the stimulus (larger voltage change for stronger stimulus). D. lasts for several seconds after ion channels have opened, closed, and reset.