18) Afferent nerves conduct nerve impuises trom A) the central nervous system to
ID: 3516033 • Letter: 1
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18) Afferent nerves conduct nerve impuises trom A) the central nervous system to effectors. B) effectors to the central nervous system O receptors to the central nervous system D) the central nervous system to receptorns E) one effector to another. The absolute refractory period is the time A) it takes a neurotransmiter to diffuse across a synaptic cleft B) it takes to reach threshold via temporal summation. C following birth when neurons can still reproduce. D)between injury to an axon and recovery of function. E folloy'ing an actlon potential during which a second action potential canot be 19) / regardless of stimulus strength. 20) During the depolarization phase of activity? A) Potassium ions are flowing into the cell B) Potassium ions are flowing out of the cell. C) D) Sodium ions are flowing out of the cell. E) Neurotransmitter is diffusing into the cell. an action potential, which of the following is the primary Sodium ions are flowing into the cell. During the depolarization phase of an action potentiál, which of the following situations edsts? A) The inside of the membrane is becoming more negative with respect to the outside. B) The inside of the membrane is becoming more positive with respect to the outside. C) The membrane is becoming less permeable to all ions. D) The membrane potential remains constant. E) The threshold is changing. 22) During the repolarization phase of an action potential, which of the following is the primary activity? A) Potassium ions are flowing into the cel. B) Potassium ions are flowing out of the cell. O) Sodium ions are flowing into the cell. D) Sodium ions are flowing out of the cell. E) The membrane is impermeable to all ions. A resting membrane potential is due to A) extracellular fluid rich in sodium 23) intracellular fluid rich in potassium. plasma membrane that is more permeable to potassium than sodium. All are correct. B) C) D)Explanation / Answer
Q 18 answer is C
afferent neuron are also called as sensory neuron as they carry sensation from body via receptors to the nerve and going to the CNS. To relay information.
Q 19 answer is E
Absolute refractory period ARP, is the period in nerve action potential when the voltage gated Na channel are in the inactivation stage during repolarisation, so they unable to generate new action potential in this period , so called as ARP.
Q20 answer is C
During depolarisation state the local current produce in dendrite reaches to axon hillock in a nerve and that cause membrane potential to change, these changes lead to opening of voltage gated Na channel and Na comes Inside membrane and make the membrane on inner side as electro positive, as depolarisation occur.
Q21 answer is B
As mentioned above the membrane in resting state have negative potential known as resting membrane potential, when the membrane depolarises by Na entry inside cell cause inside to be more positive than outside, and therefore action potentil travel to next zone from positive to negative inide membrane.
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