In the male, which muscle ejects urine or semen, compresses the base of the penis, and helps in formation of an erection?
A. External urethral sphincter
B. Superficial transverse perineal muscle
C. Pubococcygeus
D. Bulbospongiosus
E. Iliococcygeus
Answer: D
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Which of the following statements concerning the permeability of a typical neuron membrane at rest is TRUE?
A. All of the K+ channels in the membrane are open. B. The permeability to Na+ is much greater than the permeability to K+. C. The voltage-gated Na+ channels are in the inactivated state. D. There is equal permeability to Na+ and K+. E. Most of the voltage-gated Na+ channels are in the closed state.
Completion of cytokinesis does not lead to
A) production of two blastomeres. B) division of the cytoplasm into two portions. C) initiation of interphase. D) completion of cleavage. E) formation of a polar body.
The dorsal interossei muscles in the hand
a. adduct fingers 2-5. b. abduct fingers 2-5. c. flex the PIP and DIP joints. d. extend the MP joints.
Which of the following statements correctly describes the role of the hair that lines the external nares (nostrils)?
A) Hair in the nostrils enhances the sense of smell. B) Hairs of the nostrils facilitate the flow of particles into the nasal cavity. C) The hair that lines the nostrils filters foreign particles, preventing entry into the nasal cavity. D) The hair has no known function.