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Why do arteries have valves?
They do not have valves, but veins do. Valves in veins are designed to prevent backflow
Which locations in the digestive system are sites of chemical digestion?
I. Mouth
II. Stomach
III. Small intestine
A. II only
B. III only
C. Ii and III only
D. I, II, and III
D. I, II, and III
Mechanical digestion only occurs in the stomach and the mouth.
, Which of the following are functions of the urinary system?
I. Synthesizing calcitriol and secreting erythropoietin
II. Regulating the concentrations of sodium, potassium, chloride, calcium, and other ions
III. Reabsorbing or secreting hydrogen ions and bicarbonate
IV. Detecting reductions in blood volume and pressure
A. I, II, and III
B. II and III
C. II, III, and IV
D. All of the above
D. All of the above
If the pressure in the pulmonary artery is increased above normal, which chamber of the heart
will be affected first?
The right ventricle
The blood leaves the right ventricle through the semi-lunar valve and goes through the
pulmonary artery to the lungs. Any increase in pressure I the artery will eventually affect the
contractibility of the right ventricle
What is the purpose of sodium bicarbonate when released into the lumen of the small
intestine?
It increases the pH of chyme so as to prevent harm to the intestine. sodium bicarbonate is
produced by the pancreas and released in response to pyloric stimulation so that it can
neutralize the acid. It has little to no digestive effect