The diffusion of potassium ions reestablishes the resting membrane potential in a neuron immediately after it develops an action potential
Indicate whether the statement is true or false
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Which of the following carries oxygen-poor blood to the lungs from the heart?
A. The great cardiac vein B. The superior vena cava C. The pulmonary arteries D. The pulmonary veins E. The coronary sinus
Define phalanges
A) Bones of the wrist. B) Bones that make up the shoulder. C) Bones of the hand. D) Bones that make up the fingers or toes. E) Bones that make up the ankle.
Which of the following descriptions best represents the appearance of the sarcomere during peak contraction?
A. The I bands and A bands are of equal widths. B. The width of the A band is slightly less than the width of the I band. C. The H zone is equivalent to one-third of the length of the A band. D. The H zone is eliminated, and the I bands are very thin.
Released by cells as part of the nonspecific, second line of defense against infection, interferon functions in
a. interfering with the replication of extracellular bacteria. b. inhibiting replication of viruses in cells infected with them. c. preventing viruses from adhering to the cell surface and injecting their genetic material. d. is a cytokine that blocks replication of virally infected cells. e. more than one of these.