Muscarinic ACh receptors act through ________ activation of K+ channels.
A. cGMP
B. M-protein
C. G-protein
D. ATP
Answer: C
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Which of the following substances is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?
a. a cation b. an anion c. a nonpolar or nonionized molecule d. a polar molecule e. a molecule less than 0.8 nm in diameter
The medial concavity of the kidney is called the ________, which admits the renal nerves, blood vessels, lymphatic vessels, and ureter.
A. cortex B. corpuscle C. capsule D. hilum E. medulla
Muscles and glands that are capable of producing a response when stimulated by motor neurons are called
A. aponeuroses. B. effectors. C. neuromodulators. D. receptors. E. sensory organs.
Calcitonin decreases plasma Ca2+
Indicate whether the statement is true or false