Free Neurons and Nerve Impulse MCQs with Answers
95 Neurons and Nerve Impulse MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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- A. endoplasmic reticulum
- B. golgi bodies
- C. ribosome and endoplasmic reticulum
- D. mitochondria
- E. lysosomes
Explanation: Correct. Nissl granules consist of rough endoplasmic reticulum (RER) and ribosomes, which are essential for protein synthesis in neurons.
Correct answer: ribosome and endoplasmic reticulum- A. Maintenance of resting membrane potential
- B. Massive out flux of K+ after depolarization
- C. Recovery of resting potential
- D. Conversion of resting potential to action potential
Explanation: Na,K-ATPase maintains the proper concentration gradients of Na+ and K+.
Correct answer: Recovery of resting potential- A. Movement of Na+ ions into the neuron by Na+ pump
- B. Movement of Na+ions out of the neuron by Na+ gate
- C. Movement of K+ ions into the neuron by K+ pump
- D. Movement of K+ ions out of the neuron by K+ gate
Explanation: The movement of Na⁺ ions into the neuron via the Na⁺ pump requires ATP due to active transport mechanisms.
Correct answer: Movement of Na+ ions into the neuron by Na+ pump- A. Q
- B. R
- C. S
- D. P
Explanation: Hyperpolarization is a change in a cell's membrane potential that makes it more negative. It is the opposite of a depolarization.
Correct answer: Q- A. Sodium
- B. Potassium
- C. Protein
- D. Calcium
Explanation: Calcium (Ca2+) is a vital element in the process of neurotransmitter release: when Ca2+ channels are blocked, neurotransmitter release is…
Correct answer: Calcium- A. Movement of calcium ions from the axon terminals into the synaptic cleft
- B. Movement of calcium ions from the synaptic cleft into the axon terminals
- C. Movement of sodium ions into the axon terminals from the synaptic cleft
- D. Movement of sodium ions into the synaptic cleft from the axon terminals
- E. None of the above
Explanation: Explanation for this question will be added soon.
Correct answer: Movement of calcium ions from the synaptic cleft into the axon terminals- A. K+
- B. Na+
- C. Ca*
- D. Cl-
Explanation: During the non-conducting state of a neuron, the neuron membrane is permeable to the efflux of potassium ions (K+).
Correct answer: K+- A. Stay in synaptic cleft indefinitely
- B. Recycled in synaptic cleft
- C. Degraded by enzyme
- D. Taken up by postsynaptic membrane
Explanation: After transmitting the nerve impulse, the neurotrasmitters are degraded by enzymes.
Correct answer: Degraded by enzyme- A. Volta
- B. Jenner
- C. Salk
- D. Galvani
Explanation: Galvani experimented with the dissected leg of a frog and discovered the remarkable effects of static electricity, which caused their legs…
Correct answer: Galvani- A. Extra cellular sodium is high
- B. Extra cellular potassium is high
- C. Intracellular sodium is high
- D. Intracellular potassium is less
Explanation: Option A: This is true at rest, but not during an action potential. During an action potential, the concentration of sodium ions outside…
Correct answer: Intracellular sodium is high- A. Cell bodies of sensory neurons
- B. Cell bodies of interneurons
- C. Axons of interneurons
- D. Cell bodies of motor neurons
Explanation: Gray matter, the inner matter of the spinal cord does not contain cell bodies of sensory neurons.
Correct answer: Cell bodies of sensory neurons- A. -70 mV
- B. -60 mV
- C. -50 mV
- D. -40 mV
Explanation: The resting membrane potential of a neuron is the electrical potential inside the cell relative to the adjacent extracellular space.
Correct answer: -70 mV- A. Epinephrine
- B. Acetylcholine
- C. Dopamine
- D. Serotonin
Explanation: Acetylcholine is a type of chemical messenger, or neurotransmitter, that plays a vital role in the central and peripheral nervous system.
Correct answer: Acetylcholine- A. -70 mv
- B. -70 Volt
- C. 70mv
- D. -90 mv
Explanation: In most neurons the resting potential has a value of approximately −70 mV.
Correct answer: -70 mv- A. Synaptic knob
- B. Synaptic cleft
- C. Synaplic delay
- D. Synaptic vesicle
Explanation: A synapse is the small gap between two neurons, where nerve impulses are relayed by a neurotransmitter from the axon of a presynaptic…
Correct answer: Synaptic cleft- A. Axon
- B. Auxin
- C. Sehwann cell
- D. Dendrites
Explanation: An extension or process called an axon carries impulses away from the cell body.
Correct answer: Axon- A. Hormones
- B. Activators
- C. Neurotransmitters
- D. Enzymes
Explanation: Neurotransmitters are chemical compounds released by neurons after depolarization that act on other neurons to produce a response.
Correct answer: Neurotransmitters- A. 10
- B. 30
- C. 2
- D. 3
Explanation: The concentration of Na+ ions is approximately 10 times greater in fluids outside (extracellular) the cell compared to inside…
Correct answer: 10- A. Postsynaptic neuron
- B. Presynaptic neuron
- C. Synapses
- D. Dendrites
Explanation: Neurotransmitters are synthesized and stored within the presynaptic neuron, specifically in structures called synaptic vesicles.
Correct answer: Presynaptic neuron- A. Impulse
- B. Synapse
- C. Axon
- D. Cleft
Explanation: A synapse is a specialized junction between two neurons (nerve cells) where they communicate.
Correct answer: Synapse