What occurs during spermiogenesis?
A. Cytoplasm removed by Sertoli cells
B. Chromosomes are compacted by protamines
C. Flagellum and acrosome form
D. All of the choices are correct.
Answer: D
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When blood pressure increases
a. baroreceptors detect the change in the carotid arteries. b. the cardioregulatory center decreases parasympathetic stimulation of the heart. c. heart rate and stroke volume increase. d. norepinephrine secretion increases.
Which of the following is not considered an accessory structure of the eye?
A. Conjunctiva B. Palpebra C. Lacrimal apparatus D. Superior oblique E. Cornea
Movement of the cupula in the ampullae of the semicircular canals allows detection of
A) rotational movements. B) high frequency sound. C) linear acceleration. D) low frequency sound. E) a change in body position with respect to gravity.
A protein that is converted to an active enzyme is a
A. codon. B. proenzyme. C. gene. D. pre-mRNA. E. ribosomal RNA (rRNA).