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. Serotonin
- B. Aspartame
- C. Ascorbic acid
- D. Hydrazine
Explanation: Serotonin is a compound that conducts nerve impulses in the brain. It contains 68.2%C,6.86%H,15.9%N, and 9.08%O .
Correct answer: Serotonin- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Explanation:When the neuron is under action potential, the charges on the membrane are reversed.
Correct answer: Option D- A. Serotonin
- B. Acetylcholine
- C. Dopamine
- D. Adrenaline
Explanation: Explanation:The neurotransmitter that lies outside the central nervous system is Acetylcholine, it is only present in the PNS.
Correct answer: Acetylcholine- A. Is more positive outside than inside
- B. Is more negative outside than inside
- C. Has no charge on either side
- D. Has an equal charge on either side
Explanation: Option [A] A typical neuron is more positive outside than inside due to the presence of Na+ K+ pump which countertransports 3Na+ outside…
Correct answer: Is more positive outside than inside- A. Resting membrane potential
- B. Saltatory nerve impulse
- C. Threshold stimulus
- D. Initial nerve impulse
Explanation: Saltatory conduction describes how an electrical impulse skips from node to node down the full length of an axon, speeding the arrival of…
Correct answer: Saltatory nerve impulse- A. Sensory nerve fibres
- B. Myelinated nerve fibres
- C. Motor nerve fibres
- D. Mixed nerve fibres
Explanation: White matter is found in the deeper tissues of the brain (subcortical).
Correct answer: Myelinated nerve fibres- A. Afferent neuron
- B. Efferent neuron
- C. Associative neuron
- D. Interneuron
Explanation: Afferent neurons, also known as sensory neurons are responsible for establishing a link between the sensory organ and the central nervous…
Correct answer: Afferent neuron- A. Areolar tissue
- B. Tendon
- C. Neuron
- D. Ligament
Explanation: Neurons are specialized cells that make up nervous tissue, which is responsible for transmitting signals throughout the body.
Correct answer: Neuron- A. 8 pairs
- B. 10 pairs
- C. 12 pairs
- D. 31 pairs
Explanation: Humans have 12 pairs of cranial nerves that emerge directly from the brain, each designated with a specific function.
Correct answer: 12 pairs- A. Thicker the nerve fiber-less resistance to flow of current-faster the nerve impulse.
- B. Thicker the nerve fiber-more resistance to flow of current-slower the nerve impulse
- C. Thinner the nerve fiber-less resistance to flow of current-slower the nerve impulse
- D. None of the above
Explanation: The correct answer is that thicker nerve fibers have less resistance to the flow of current, leading to faster nerve impulse transmission.
Correct answer: Thicker the nerve fiber-less resistance to flow of current-faster the nerve impulse.- A. 5
- B. 10
- C. 15
- D. 20
Explanation: The Na+/K+ pump, also known as Na+/K+-ATPase, is crucial in maintaining the resting membrane potential of cells by actively transporting…
Correct answer: 15- A. Para sympathetic
- B. Sympathetic
- C. Somatic
- D. Peripheral
Explanation: The parasympathetic nervous system predominates in quiet "rest and digest" conditions while the sympathetic nervous system drives the…
Correct answer: Sympathetic- A. Na+ into the axon and K+ out of the axon
- B. K+ into the axon and Na+ out of the axon
- C. Na+ and K+ within the axon toward the axon terminal
- D. Increased Na+ permeability leading to an influx of Na+
Explanation: When a neuron fiber is stimulated by a stimulus of adequate strength (threshold stimulus), the stimulated area of the fiber becomes…
Correct answer: Increased Na+ permeability leading to an influx of Na+- A. Respiratory system
- B. Nervous system
- C. Circulatory system
- D. Bones and muscles
Explanation: Tetanus is an infection of the nervous system caused by Clostridium tetani bacteria.
Correct answer: Nervous system- A. Myofibrils
- B. Lines
- C. Sarcolemma
- D. Dendrites
Explanation: Dendrites are specialized extensions of nerve cells that receive electrical signals from other nerve cells and transmit them towards the…
Correct answer: Dendrites