The period between the closure of the semilunar valve and the opening of the atrioventricular valves is called:
A) atrial systole.
B) isovolumetric ventricular contraction.
C) isovolumetric ventricular relaxation.
D) passive ventricular filling.
Answer: C) isovolumetric ventricular relaxation.
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During the rising phase of the action potential,
a. PK+ is much greater than PNa+ b. PNa+ is much greater than PK+ c. PK+ is the same as P Na+ d. Na+ efflux occurs e. b and d are true
Which of the following veins does NOT drain into the hepatic portal vein?
A) inferior mesenteric vein B) superior mesenteric vein C) inferior phrenic vein D) gastrosplenic vein
The right and left renal arteries transport ____ mL of blood to the kidneys every minute
a. 800 b. 90 c. 1200 d. 200
Identify the role of the urinary system in acid-base balance
1. The kidneys can secrete bicarbonate ions when the pH of the blood rises. 2. The kidneys contribute to acid-base balance by excreting fixed acids that the lungs cannot excrete. 3. The kidneys can manufacture new bicarbonate ions when the pH of the blood falls. 4. The kidneys contribute to acid-base balance by controlling the concentration of bicarbonate ions in the blood. A) 2, 3, 4, but not 1 B) 1, 3, 4, but not 2 C) 1, 2, 3, 4 D) 1, 2, 3, but not 4