Endothelial cells within capillaries of the brain are linked to their neighbors by ______ junctions that prevent diffusion of some substances across the capillary wall
Fill in the blank with correct word.
tight
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Many factors influence BMR. What is the most critical factor?
A) the way an individual metabolizes fat B) the way skeletal muscles break down glycogen C) the ratio of surface area to volume (weight) of the body D) an individual's body weight
Spinal reflexes
A) are monosynaptic and involve only one segment of the cord. B) involve only a single segment of the spinal cord. C) always transmit information to the brain for processing. D) include both monosynaptic and polysynaptic reflexes. E) include monosynaptic reflexes only.
When NAD+ is ________ it becomes NADH
A) reduced B) oxidized C) hydrolyzed D) catabolized
Which of the following illustrates acute hormone secretion most accurately?
A. Blood levels of hormone B are maintained at constant levels at all times with very small deviations throughout a 24-hour period. B. Blood levels of hormone A are maintained constantly but increase regularly around meal times. C. Blood levels of hormone C are relatively constant but will increase dramatically under some stressful situations but not as much under other stressful situations.