Answer the following statements true (T) or false (F)
1. Two neuron reflexes contain an interneuron and a motor neuron.
2. A ganglion is a group of nerve cell bodies located in the peripheral nervous system.
3. The difference between a two- and three-neuron reflex is the presence of an interneuron.
4. All interneurons are found in the central nervous system.
5. Multiple sclerosis is a disorder caused by injury or death to the oligodendrocytes.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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The sarcolemma
a. is the muscle cell plasma membrane b. provide a means of rapidly transmitting the action potential from the surface into the central portions of the muscle fiber. c. store ATP. d. run longitudinally between the myofibrils. e. have expanded lateral sacs.
Gas exchange at the respiratory membrane is efficient because
A. the difference in partial pressures is substantial. B. the distances involved in exchange are small. C. the total surface area of the membrane is large. D. blood flow and air flow are coordinated (blood flow is highest around alveoli with highest Po2). E. All of these are correct.
During digestion, the concentration of hydrogen ions (H+) in the stomach contents increases to many times that in cells lining the stomach. Which transport process could be responsible?
A) osmosis B) simple diffusion C) facilitated diffusion D) active transport E) exocytosis
Which lobe of the cerebrum is responsible for general senses like touch?
A. Parietal B. Temporal C. Frontal D. Occipital