Both chemical and mechanical digestion start in the mouth and continue in the stomach
Indicate whether the statement is true or false
TRUE
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Which choice describes the countercurrent mechanism of the nephron loop?
A) Water moves out of the ascending limb; sodium moves in the ascending limb B) Water moves in the ascending limb; sodium moves out of the ascending limb C) Water moves in the descending limb; sodium moves out of the descending limb D) Water moves out of the descending limb; sodium moves out of the ascending limb
The motor end-plate region undergoes a threshold potential, so an action potential is initiated at this site
a. True b. False Indicate whether the statement is true or false
Which of the following statements regarding the cardiac cycle is TRUE?
A. The AV valves are open during mid-to-late diastole. B. The aortic valve is open during isovolumetric ventricular contraction. C. The first heart sound is caused by the closing of the semilunar valves. D. The dicrotic notch is a result of closure of the AV valves. E. Closure of the AV valves occurs when the ventricles reach end-systolic volume.
What chemical is a reactant in the hydrolysis of food?
A. Bicarbonate ion B. Hydrochloric acid C. Carbon dioxide D. Water