Which of the following statements regarding phagocytes and phagocytosis is TRUE?
A. Macrophages, monocytes, and mast cells are phagocytes.
B. Contact of phagocytes with microbes stimulates the phagocytes to release chemicals that mediate the inflammatory response.
C. Phagocytosis is a process that only occurs within the bloodstream.
D. Phagocytosis is stimulated by the presence of proteins called rhodopsins.
E. Phagocytosis is the process by which leukocytes exit the bloodstream.
Answer: B
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Autonomic tone is an important aspect of ANS function because it
A) allows ANS neurons to be silent under normal conditions. B) allows ANS neurons to increase activity on demand but not decrease their activity. C) allows ANS neurons to decrease their activity on demand but not increase their activity. D) allows ANS neurons to increase or decrease their activity, providing a range of control options. E) provides for a narrow range of control options that keeps target tissues constantly active.
When the load to be lifted increases in weight, the latent period _______
A) decreases and disappears B) increases C) remains unchanged D) decreases
Kinetic energy is
A. stored energy that could do work but is not doing so. B. energy that moves in waves. C. the form of energy that actually does work. D. movement of ions or electrons. E. energy that flows between objects with different temperatures.
Each complex in the electron transport chain collectively acts as a ________ pump that removes H+ from the mitochondrial matrix and pumps it into the space between the inner and outer mitochondrial membranes.
A. sodium-potassium B. electron C. neutron D. proton E. calcium