What is the function of LH?
A. Testosterone secretion
B. Ovulation
C. Both of these are correct.
D. Neither of these is correct.
Answer: C
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The external urethral sphincter
A. is controlled by the somatic nervous system. B. surrounds the external urethral orifice. C. opens before the internal urethral sphincter during the micturition reflex. D. is composed of smooth muscle fibers. E. All of the choices are correct.
What class of drugs selectively blocks the reuptake of serotonin into presynaptic axon terminals?
a. phosphodiesterase-type 5 (PDE-5) inhibitors b. selective serotonin reuptake stimulators (SSRSs) c. phosphodiesterase-type 5 (PDE-5) stimulators d. selective serotonin reuptake inhibitors (SSRIs) e. phosphodiesterase-type 2 (PDE-2) inhibitors
Which of the following statements regarding contraction in skeletal and smooth muscle is TRUE?
A. In skeletal muscle, calcium initiates contraction by binding to troponin, while in smooth muscle calcium initiates contraction by binding directly to myosin. B. In skeletal muscle, calcium ions bind to a regulatory protein on thin filaments; in smooth muscle, calcium ions bind to a regulatory protein on thick filaments. C. In skeletal muscle, calcium initiates contraction by binding to myosin light-chain kinase, while in smooth muscle calcium initiates contraction by binding directly to tropomyosin. D. In skeletal muscle, calcium initiates contraction by binding to troponin, while in smooth muscle calcium initiates contraction by binding to calmodulin. E. All of the choices are true.
Which type of muscle tissues performs anaerobic respiration?
A. Smooth B. Cardiac C. Skeletal D. All of the answers are correct