When shoveling snow from the driveway, the older man did not feel the bitter cold. Which action made his blood vessels get smaller in diameter, conserving heat in the warm core of his body?
A. Vasomotor
B. Vasodilation
C. Vasoconstriction
D. Vasopressor
Answer: C
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You and your colleague are medical technicians in a cardiac function lab. You are reading the ECG of a patient and your friend is trying to capture an image of the AV valves opening using an ultrasound. At what point should you tell your friend to start recording images?
A. After the T wave B. Just after the P wave C. Just before the T wave D. Just before the P wave E. At the beginning of the QRS complex
Growth hormone
a. closes the epiphyseal plate of long bones b. promotes hypertrophy and hyperplasia c. secretion is stimulated by an increased blood glucose level d. is the only factor responsible for governing the growth of an individual e. has all of the above characteristics
The atrioventricular valves permit blood flow
A) in one direction only. B) in both directions. C) in many directions. D) in opposite directions on the right and left. E) None of the answers is correct.
Eye color is caused by genes at multiple loci. This phenomenon is called ________
A) incomplete dominance B) sex linkage C) multiple carriers D) polygenic inheritance E) pleiotropy