The falling phase of the action potential is due primarily to
A) Na+ flow out of the cell only.
B) K+ flow out of the cell only.
C) Na+ flow out of the cell and K+ flow into the cell.
D) Na+ flow in the cell only.
E) K+ flow into the cell only.
B) K+ flow out of the cell only.
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Which of the following is not a function of the kidneys?
a. They contribute to long-term regulation of arterial blood pressure by maintaining the proper plasma volume. b. They act directly on the interstitial fluid to maintain constancy in its composition. c. They excrete the metabolic waste products. d. They assist in maintaining the proper acid-base balance of the body. e. They secrete a hormone.
These collagen fibers help to connect ligaments and tendons to the periosteum of the bone
A. Purkinje fibers B. Golgi fibers C. Sharpey fibers D. Haversian fibers E. endosteal fibers
Elevated antibody production during a primary response generally lasts for months or years, whereas antibody production in secondary responses decreases to baseline level generally within a couple of weeks
Indicate whether this statement is true or false.
What is the main factor that determines the power of a muscle?
A) the length B) the shape C) the number of neurons innervating it D) the total number of muscle cells available for contraction