When a stimulus occurs, sensory systems start the process of signaling its occurrence with a(n)
A. all-or-none response.
B. ectopic response.
C. postsynaptic potential.
D. receptor potential.
E. action potential.
Answer: D
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Alzheimer's disease is thought to involve primarily
A. loss of neurons that secrete or respond to dopamine. B. tumors that produce excess serotonin. C. loss of neurons that secrete or respond to catecholamines. D. loss of cholinergic neurons. E. loss of adrenergic neurons.
One substance has no membrane transporters to move it but can diffuse freely through open leak channels if there is a concentration gradient. Initially, this substance's concentrations in the filtrate and extracellular fluid are equal. Later, however, the active transport of Na+ and other solutes creates a gradient by removing water from the lumen of the tubule where it is located. What substance
is this? A) urea B) glucose and calcium C) glucose D) glucose, calcium, and urea E) calcium
Microorganisms inhaled into the airways are most likely to be destroyed by:
A. antibodies in respiratory mucus. B. the cilia whipping them to death. C. digestion by gastric juice. D. surfactant.
As the result of an accident, Bill suffers a dislocated jaw. This injury would involve the
A) stylohyoid ligaments. B) hyoid bone. C) condylar process of the mandible. D) alveolar process of the mandible. E) greater horn of the hyoid bone.