Contraction of the cremaster muscle occurs because of
A) sexual arousal and temperature change.
B) lowered sperm production and high hormone levels.
C) sexual arousal and lowered sperm production.
D) temperature change and lowered sperm production.
E) None of the answers are corre
A) sexual arousal and temperature change.
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In a series of measurements of resting membrane potentials, the following values were recorded. Which one is likeliest to be an error?
A) -10 mV B) -20 mV C) -40 mV D) -70 mV E) +100 mV
Urine flows through the organs of the urinary system in the following sequence:
a. ureter, kidney, bladder, urethra b. kidney, bladder, ureter, urethra c. kidney, urethra, bladder, ureter d. kidney, ureter, bladder, urethra
The canal that runs through the core of each osteon (the Haversian canal) is the site of ________
A) cartilage and interstitial lamellae B) osteoclasts and osteoblasts C) yellow marrow and spicules D) blood vessels and nerve fibers
In which layer of the epidermis are lamellar bodies formed inside keratinocytes?
A. Stratum spinosum B. Stratum corneum C. Stratum basale D. Stratum lucidum E. Stratum granulosum