How many layers of smooth muscle are generally found in the muscularis layer of the digestive tract wall (for example, in the wall of the small intestine)?
A. One
B. Two
C. Three
D. None
Answer: B
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The chordae tendineae
keep the semilunar valves open. keep the AV valves from being pushed into the atria during ventricular systole. stimulate the SA node. are part of the internal conduction system of the heart.
Because lymph vessels are very low-pressure conduits, movements of adjacent tissues are important in propelling lymph through the lymphatics
Indicate whether the statement is true or false
Platelets release ________, a chemical vasoconstrictor that contributes to the vascular spasm
A) prostacyclin B) serotonin C) thrombin D) thromboplastin E) heparin
The hormone(s) that may be slowly administered by intravenous drip to accelerate labor and delivery is/are
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