As the number of glucose carriers increased, the concentration of glucose in the _______.
A) distal tubule increased and bladder decreased
B) distal tubule decreased and bladder decreased
C) distal tubule decreased
D) distal tubule increased
E) bladder decreased
Answer: B) distal tubule decreased and bladder decreased
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________ are donut-shaped muscles that act as doors to let material in or out.
A. Sphincters B. Intercalated discs C. Aponeuroses D. Primary movers
Why does damaged cartilage heal slowly?
A) Chondrocytes cannot be replaced if killed, and other cell types must take their place. B) Cartilage is avascular, so nutrients and other molecules must diffuse to the site of injury. C) Damaged cartilage becomes calcified, thus blocking the movement of materials required for healing. D) Chondrocytes divide more slowly than other cell types, delaying the healing process. E) Damaged collagen cannot be quickly replaced, thus slowing the healing process.
Which of the neurons is a touch receptor known as a Merkel disc?
The quantal nature of chemical synaptic transmission is BEST supported by observation of:
A. spontaneous mEPPs B. discrete jumps in EPPs amplitude when [Ca++] is normal C. EPPs that vary smoothly in amplitude D. a constant EPP amplitude E. evoked EPPs smaller than mEPPs