What must rush into a muscle cell to promote its depolarization?
A) potassium ions
B) calcium ions
C) acetylcholine
D) sodium ions
E) acetylcholinesterase
D
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Fast glycolytic fibers have:
a. resistance to fatigue. b. white color fibers c. high oxidative capacity d. many mitochondria. e. slow speed of contraction.
The hyperpolarization that occurs at the end of an action potential is due to the prolonged
A. open state of chemically gated sodium channels. B. open state of voltage-gated sodium channels. C. closure of chemically gated sodium channels. D. closure of voltage-gated potassium channels. E. open state of voltage-gated potassium channels.
On a hot August day at the beach, the lifeguard jumped up and ran into the water, throwing a life-buoy to a troubled swimmer calling for help, and pulling her to safety. He was happy to help the swimmer, and once back on the beach, he realized that being
in the water cooled him off a great deal. What form of heat transfer contributed to his feeling cooler? A) convection B) radiation C) conduction D) evaporation
The main role of the axial skeleton is to protect and support vital organs. Is this statement true or false?
Indicate whether the statement is true or false.