A patient visits a doctor for a routine checkup. A nurse uses a sphygmomanometer to measure the patient's pulse at the brachial artery. The nurse raises the pressure to a point at which a rhythmic pulsing sound is no longer audible. When the nurse releases pressure, the pulsing sound returns. What pressure is producing this sound?
a. diastolic pressure
b. systolic pressure
c. venous pressure
d. capillary hydrostatic pressure
Ans: b. systolic pressure
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Which is correct regarding chromosome numbers during oogenesis?
A. Both primary oocytes and secondary oocytes are haploid. B. Both primary oocytes and secondary oocytes are diploid. C. Primary oocytes are haploid, secondary oocytes may be haploid or diploid depending on their meiotic stage. D. Primary oocytes are haploid, secondary oocytes are diploid. E. Primary oocytes are diploid, secondary oocytes are haploid.
The protein that reduces water loss at the skin surface is
A) eleidin. B) collagen. C) mucin. D) keratin. E) melanin.
Photoreceptors that convey our ability to see color are
A) rods. B) cones. C) amacrine cells. D) horizontal cells. E) bipolar cells.
During spermatogenesis, the first meiotic division yields two ____, and the second meiotic division yields four ____
a. primary spermatocytes; secondary spermatocytes b. secondary spermatocytes; spermatids c. spermatids; spermatozoa d. spermatogonia; primary spermatocytes e. spermatogonia; secondary spermatocytes