The testes are housed in which structure to maintain proper temperature for sperm production?
a. urethra
b. vas deferens
c. ejaculatory duct
d. epididymis
e. scrotum
ANSWER: e
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Why is calcium necessary for muscle contraction?
A. Calcium is needed to activate troponin so that tropomyosin can be moved to expose the myosin-binding sites on the actin filament. B. Calcium is needed to allow the muscle fiber to become depolarized. C. Calcium functions as a neurotransmitter and is released from the motor neuron. D. Calcium is needed to cock the myosin head so that it can form a cross-bridge with actin. E. Calcium is needed to detach the myosin from the actin.
Capillary waves are small
Indicate whether the statement is true or false
Many scientists feel that we are headed toward another mass extinction because of man's actions and our effect on the ecosystem Earth. What have we learned from previous mass extinctions that may provide an idea of the consequences of such a mass extinction? What should man do to try to prevent such an occurrence?
What will be an ideal response?
Fever, fatigue, loss of appetite, and a yellow color of the sclera and skin, without hemorrhaging or kidney damage, are typically observed with
A) gastroenteritis. B) dengue fever. C) hepatitis. D) rubella. E) yellow fever.