Which of the following statements about blood vessels is TRUE?
A. Blood vessels receive their oxygen and other nutrients from the blood flowing through them.
B. Gas and nutrient exchanges between the blood vessels and tissues occurs only in the capillaries.
C. Arterial walls are generally thinner and contain less elastic tissue than venous walls.
D. Veins have smaller lumens than those of comparable arteries.
E. All blood vessels have three coats or tunics.
Answer: B. Gas and nutrient exchanges between the blood vessels and tissues occurs only in the capillaries.
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The esophagus is in the gastrointestinal system.
Answer the following statement true (T) or false (F)
The all-or-none principle states that
A) all stimuli will produce identical action potentials. B) all stimuli great enough to bring the membrane to threshold will produce identical action potentials. C) the greater the magnitude of the stimuli, the greater the magnitude of the action potential. D) only sensory stimuli can activate action potentials. E) only motor stimuli can activate action potentials.
Which of the following categories of hypertension drugs lower blood pressure by blocking formation of angiotensin II, which results in vasodilation and decreased aldosterone secretion?
a) Diuretics b) ACE inhibitors c) Beta blockers d) Calcium channel blockers e) Anabolic steroids
The area of the urinary bladder bounded by the openings of the two ureters and the urethra is called the
A) trigone. B) rugae. C) vasa recta. D) detrusor muscle. E) lamina propria.