The T tubules
a. form the Z lines.
b. store Ca2+.
c. provide a means of rapidly transmitting the action potential to the central portions of the muscle fiber.
d. allow for nutrients to be carried into the cell.
e. none of these answers.
C
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Which division functions to increase alertness and direct bodily responses in stressful situations?
A. Parasympathetic B. Sympathetic
Blood returning to the heart from the systemic circulation drains via the superior vena cava and the ________.
Fill in the blank(s) with the appropriate word(s).
Damage to an autonomic neuron makes the effector more sensitive to stimulation.
Answer the following statement true (T) or false (F)
Pinocytosis
A. forms vesicles only when large amounts of material are being transported. B. does not require ATP. C. is a form of exocytosis. D. involves ingestion of liquids rather than particles. E. does not require the formation of vesicles.