Like the small intestine, the large intestine contains intestinal glands and villi.
Answer the following statement true (T) or false (F)
False
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Gradation of muscle contraction can be accomplished by stimulating variable portions of each muscle fiber
Indicate whether the statement is true or false
Summarize the two phases of the cardiac cycle during which all four heart valves are briefly closed
What will be an ideal response?
A portal system
A. is one in which multiple arteries converge on one organ or body region. B. is a simple circulatory system with an arteriovenous anastomosis. C. includes a functional end artery that makes an arterial anastomosis. D. is one in which blood flows through two capillary beds before being sent back to the heart. E. is one in which circulation to a large organ involves only one artery and one main (portal) vein.
Which of the following statements concerning the dorsal and ventral respiratory groups is false?
A. There is cross communication between these two groups. B. These groups increase the number of action potentials to the respiratory muscles during inspiration. C. They are located in the reticular activating system. D. Two dorsal and two ventral respiratory groups make up the medullary respiratory center. E. These groups establish the basic rate and depth of breathing.