The sympathetic division of the ANS causes __________ of airway smooth muscle; therefore, resistance is __________.
relaxation; increased
constriction; increased
constriction; decreased
relaxation; decreased
none of the choices are correct
relaxation; decreased
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Parasympathetic innervation to the heart
a. involves the vagus nerve b. decreases the rate at which the pacemaker potential reaches threshold c. decreases the strength of ventricular contraction d. is characterized by all of the above e. is characterized by only a and b
What is a possible cause of stenosis of the bicuspid valve?
A. Pericarditis B. Endocarditis C. Angina pectoris D. Cardiomyopathy E. Rheumatic fever
Why does blood velocity decrease as it flows into a capillary bed?
A. The diameter of the capillaries is smaller than that of the arterioles and arteries. B. The cross-sectional area of the capillary beds is approximately 2000 than that of the aorta. C. The arteries are constricted. D. The pressure is much higher in the capillaries.
Which of the following does not move substances across capillary walls?
A. Reabsorption B. Diffusion C. Filtration D. Group transport E. Transcytosis