As a result of the long refractory period in the cardiac action potential, cardiac muscle cannot exhibit
A) tonus.
B) treppe.
C) tetany.
D) recruitment.
E) fatigue.
Answer: C
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Which correctly describes renin?
A. It acts on the adrenal cortex to stimulate aldosterone secretion. B. Its secretion is stimulated by elevated blood pressure in the renal afferent arterioles. C. Its secretion is enhanced by high levels of Na+ in the macula densa. D. It is secreted by juxtaglomerular cells in renal afferent arterioles. E. It is secreted by the liver in response to low blood pressure.
The property of muscle tissue that allows an impulse to travel down the entire length of the cell membrane is
A. elasticity. B. conductivity. C. extensibility. D. contractility. E. responsibility.
1. List the veins that a drop of blood will pass through as it leaves the foot and returns to the heart: 2. Saphenous vein 3. Popliteal vein 4. External iliac vein 5. Femoral vein
A) 3, 2, 4, 1 B) 2, 3, 4, 1 C) 2, 4, 3, 1 D) 3, 2, 1, 4 E) 2, 1, 4, 3
The study of the structure and function of cells is called ________.
A. comparative physiology B. radiology C. exploratory physiology D. cytology E. gross anatomy