Almost ________ percent of the body's weight comes from its muscles.
A. 15
B. 50
C. 65
D. 80
Answer: B
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Which of the following is an example of a uniaxial joint?
A. hip B. carpals C. elbow D. base of thumb
Receptors
a. may be either a specialized ending of an afferent neuron or a special cell closely associated with the peripheral ending of an afferent neuron. b. are present for every modality in the environment. c. when stimulated bring about opening of Na+ channels in the afferent neuron membrane adjacent to the receptor. d. two of these answers. e. all of these answers.
The urinary and respiratory systems help the body to remove:
A) unabsorbed food residue. B) metabolic waste products. C) excess calories. D) All of these choices are correct.
During spermatogenesis _______________________
A. the acrosome migrates towards the posterior end of the spermatid because its hydrolytic enzymes will be needed for digestion of the excessive cytoplasm around the flagella of the developing sperm B. the acrosome migrates towards the anterior end of the spermatid because its hydrolytic enzymes will be needed for penetration when the sperm contacts the egg during fertilization C. the acrosome migrates towards the anterior end of the spermatid because its pointy shape helps the sperm move more efficiently D. the acrosome migrates towards the posterior end of the spermatid because of its ability to propel the flagella moving the sperm through the female reproductive system towards the egg