Which of the labeled structures in the diagram is the supraspinous fossa?
a) A
b) B
c) C
d) D
e) E
c
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If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________.
A) threshold is reached more quickly and heart rate would increase B) potassium channels compensate and no change in heart rate would occur C) heart rate would decrease, but blood pressure would rise due to the excess sodium present D) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
When calcium levels in the blood are low, the ________ produce _______ which stimulates the breakdown of bone, releasing calcium.
A. parathyroid glands; parathyroid hormone B. parathyroid glands; calcitonin C. adrenal glands; calcitonin D. adrenal glands; aldosterone
Although severing a peripheral axon leads to some degeneration, the neurilemma remains largely intact.
Answer the following statement true (T) or false (F)
Simple goiter
A. is an enlargement of the thymus gland. B. is due to lack of iodine in the diet. C. is due to high levels of thyroxine in the blood. D. is described by all of these characteristics.