Biol 2110 R. Socci Name Date: Questions 1-16:Multiple Choice: Enter the letter o
ID: 3479387 • Letter: B
Question
Biol 2110 R. Socci Name Date: Questions 1-16:Multiple Choice: Enter the letter of the correct answer A resting nerve fiber is polarized because the concentration a. Na+ and K+ ions is higher on the inside of the cell membrane. b. Na+ and K+ ions is higher outside the cell membrane. c. Na+ is higher on the inside and K+is higher on the outside. d. Na+ is higher on the outside and K+is higher on the inside. 2. During the absolute refractory period a. Protein anions are leaving the neuron. b. A very strong stimulus can generate a new action potential. c. Neurotransmitters are being secreted. d. Even a very strong stimulus cannot initiate a new action potential. 3. When threshold of a neuron is reached a. A summation. b. An action potential. c. A resting potential. d. A graded potential. is produced. If the ventral root of a spinal nerve were cut, what would be the result in the region supplied by that nerve? a. Loss of sensation. b. Loss of movement. c. Some loss of both sensation and movement. d. Loss of autonomic control of blood vessels and sweat glands. 5. The cochlear nuclei are located in the: a. Pons. b. Medulla. c. Thalamus. d. Midbrain.Explanation / Answer
2)D
This is the time during which another stimulus given to the neuron (no matter how strong) will not lead to a second action potential. Thus, because Na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials. The absolute refractory periodtakes about 1-2 ms.
3)A
5)B
1)D
4)B
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