In utero, the fetus is nourished by the ________.
A. umbilical cord
B. amniotic fluid
C. placenta
D. amnion
Answer: C
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During excitation-contraction coupling,
a. the action potential travels down the T tubules b. Ca2+ is released from the sarcoplasmic reticulum c. Ca2+ is taken up by the sarcoplasmic reticulum d. both a and b occur e. both a and c occur
Lipase breaks down proteins via hydrolysis
Indicate whether the statement is true or false
The first structure to intercept light as it enters the eye is the
a. aqueous humor. b. cornea. c. lens. d. retina. e. vitreous humor.
What would be the best explanation for why myelinated fibers conduct signals faster than unmyelinated fibers?
A. There are no internodes in unmyelinated fibers. B. Facilitated diffusion of sodium and potassium is faster in myelinated fibers. C. There are more internodes in unmyelinated fibers. D. Diffusion of ions along the axoplasm is faster. E. Active transport of sodium and potassium is faster in myelinated fibers.