What is the physiological importance of the fact that the male testes descend to reside in the scrotal sac?
What will be an ideal response?
The male testes descend into the scrotal sac so that a fairly constant intrascrotal temperature is maintained. Failure of the testes to descend results in sterility, because production of viable spermatozoa requires a temperature several degrees lower than normal body temperature.
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The ureters
A) are retroperitoneal. B) float freely within the abdominal cavity. C) have specialized subdivisions called the urethrae. D) take exactly the same path to the bladder in men and women. E) None of the answers are correct.
Schwann cells promote axonal growth, while oligodendrocytes inhibit it
Indicate whether the statement is true or false
Neurosecretory neurons
a. release neurotransmitters. b. release hormones. c. are unable to conduct action potentials, unlike ordinary neurons. d. both release neurotransmitters and are unable to conduct action potentials, unlike ordinary neurons. e. both release hormones and are unable to conduct action potentials, unlike ordinary neurons.
According to the Frank-Starling principle, the cardiac output is directly related to (the)
A) size of the ventricle. B) heart rate. C) venous return. D) thickness of the myocardium. E) total amount of blood in the cardiovascular system.