Which of the following structures is correctly matched with its function?
A) Ascending limb of the loop of Henle: major site of secretion of K+
B) Descending limb of the loop of Henle: major site for transport of solutes
C) Proximal tubule: site of secretion of organic anions and cations
D) Distal tubule: main site of reabsorption of Ca2+and Mg2+
Answer: C
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What is the definition of a "motor unit"?
A. All of the motor neurons supplying a single muscle B. A pair of antagonistic muscles C. A single motor neuron plus all the muscle fibers it innervates D. A single muscle fiber plus all of the motor neurons that innervate it E. All of the muscles that affect the movement of any given joint
In the Krebs cycle, citric acid is followed by ________ acid.
Fill in the blank(s) with the appropriate word(s).
Degeneration of the neurons in which of the following structures leads to the muscle tremors associated with Parkinson disease?
A. Cerebral crus B. Inferior colliculi C. Pons D. Tegmentum E. Substantia nigra
The placenta is the organ that:
a. Protects the fetus against shock or adhesion b. Directly connects the fetal and maternal blood supplies c. Transfers maternal nutrients to the fetus d. Connects the embryo to the vaginal wall