Which statement is correct?
a. Water reabsorption is under control of vasopressin throughout the length of the nephron.
b. The ascending limb of the loop of Henle is always impermeable to water.
c. Vasopressin makes the distal and collecting tubules impermeable to water.
d. Fifteen percent of the filtered water osmotically follows the absorption of Na+ and other solutes in the proximal tubule.
e. Water reabsorption is passive in the early portions of the nephron but is active in the distal portions of the nephron.
B
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Which of the following neurotransmitters are known to bind to G-protein coupled receptors?
A) epinephrine B) serotonin C) dopamine D) GABA E) All of these bind to G-protein coupled receptors.
Which of the following is the most concentrated cation in the extracellular fluid that is required for muscle contraction, blood clotting and nerve impulse conduction?
A. Sodium B. Potassium C. Chloride D. Calcium
The _________________ in a muscle fiber stores calcium in between contractions.
Fill in the blank(s) with correct word.
What is the primary function of the large intestine?
A. Secretion of water, salts, sodium bicarbonate, and enzymes B. Protein digestion and nutrient absorption C. Storage of vitamins and minerals D. Water and electrolyte absorption