What type of receptor is located in the membranes of all parasympathetic target cells?
A) nicotinic receptor
B) beta receptor
C) alpha receptor
D) muscarinic receptor
Answer: D
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Which of the following substances is most likely to passively diffuse across the plasma membrane by dissolving in the membrane?
a. a cation b. an anion c. a nonpolar or nonionized molecule d. a polar molecule e. a molecule less than 0.8 nm in diameter
Compare the oxygen content in the two circulatory circuits
A) The pulmonary circuit carries deoxygenated blood from the right ventricle to the lungs and returns oxygenated blood to the left atrium. The systemic circuit carries oxygenated blood to the organs and tissues of the body and returns deoxygenated blood to the right atrium. B) The pulmonary circuit carries deoxygenated blood from the left ventricle to the lungs and returns oxygenated blood to the right atrium. The systemic circuit carries oxygenated blood to the organs and tissues of the body and returns deoxygenated blood to the left atrium. C) The pulmonary circuit carries oxygenated blood from the right ventricle to the lungs and returns deoxygenated blood to the left atrium. The systemic circuit carries deoxygenated blood to the organs and tissues of the body and returns oxygenated blood to the right atrium. D) The pulmonary circuit carries oxygenated blood from the left ventricle to the lungs and returns deoxygenated blood to the right atrium. The systemic circuit carries deoxygenated blood to the organs and tissues of the body and returns oxygenated blood to the left atrium. E) The pulmonary circuit carries deoxygenated blood from the right ventricle to the lungs and returns deoxygenated blood to the left atrium. The systemic circuit carries oxygenated blood to the organs and tissues of the body and returns oxygenated blood to the right atrium.
Chemotaxis:
A. refers to the chemical attraction of neutrophils to a site of inflammation. B. is important only for innate immune responses. C. is important only for adaptive immune responses. D. refers to the engulfing of microbes and foreign molecules by macrophages. E. refers to dilation of blood vessels by chemicals released by damaged tissue cells.
Regulation of sex hormone levels is an example of negative feedback homeostatic control.
Answer the following statement true (T) or false (F)