Atrial depolarization causes the _________.
A. P wave
B. QRS complex
C. T wave
D. first heart sound
E. quiescent period
A. P wave
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After urine is formed, it drains into a central collecting cavity, the renal pelvis, located at the medial inner core of each kidney
a. True b. False Indicate whether the statement is true or false
Upon cold exposure all of the following occur except
a. skin vasoconstriction. b. decreased muscle tone. c. nonshivering thermogenesis. d. behavioral adaptations. e. stimulation of thermoreceptors.
What may happen if the ductus arteriosus fails to close shortly after birth?
A. Blood may flow from the right atrium to the left atrium. B. The walls of the heart may become thin and flaccid. C. Blood may flow from the aortic arch to the lungs. D. The coronary arteries may have abnormally increased blood flow. E. Valvular stenosis may interrupt blood flow.
The internal environment
a. is not in direct contact with the body's cells b. consists of the intracellular fluid c. must be maintained at absolutely unchanging composition, temperature, and volume for survival of the body d. is in direct contact with the body's cells and consists of the extracellular fluid e. consists of the intracellular fluid and must be maintained at absolutely unchanging composition, temperature, and volume for survival of the body