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. Regulation of body functions
- B. Organization of body functions
- C. Integration of body functions
- D. All of these
Explanation: Coordination integrates information and organizes body activities so that functions are regulated and produce a suitable overall response.
Correct answer: All of these- A. 100 m/sec
- B. 110 m/sec
- C. 120m/sec
- D. 130 m/sec.
Explanation: The fastest impulses in heavily myelinated neurons travel at about 120 m/sec, or 120 metres per second, because myelin allows saltatory…
Correct answer: 120m/sec- A. Hydra
- B. Man
- C. Planaria
- D. Cockroach
Explanation: Hydra has a diffuse nerve net but no central nervous system, brain, or spinal cord.
Correct answer: Hydra- A. 10
- B. 11
- C. 12
- D. 13
Explanation: Humans have 12 pairs of cranial nerves, arising from the brain and mainly serving the head and neck.
Correct answer: 12- A. - 50 mv
- B. - 60 mv
- C. - 70 mv
- D. - 80 mv
Explanation: A neuron's resting membrane potential is approximately -70 mV because the membrane is more permeable to K+ than Na+ and the Na+-K+ pump…
Correct answer: - 70 mv- A. Na+
- B. K+
- C. Cl-
- D. PO4-2
Explanation: At rest, the neuronal membrane has many potassium leak channels and is therefore much more permeable to K+ than to Na+ or large…
Correct answer: K+- A. Active
- B. Passive
- C. Diffusional
- D. None of these.
Explanation: The sodium-potassium pump uses ATP to move 3 Na+ out of the neuron and 2 K+ into it, both against their concentration gradients.
Correct answer: Active- A. Sensory neurons
- B. Motor neurons
- C. Associative neurons
- D. None of these
Explanation: Associative neurons, also called interneurons, connect sensory and motor pathways within the central nervous system.
Correct answer: Associative neurons- A. They not only conduct impulses but also generate them
- B. They are not the only cellular component of nervous system
- C. They may show limited regenerative capabilities
- D. Like all the living cell, when they mature and divide to form similar cells
Explanation: Mature neurons are highly specialized and usually remain in the non-dividing G0 phase, although limited repair or regeneration can occur…
Correct answer: Like all the living cell, when they mature and divide to form similar cells- A. Relay, Sensory
- B. Sensory, Motor
- C. Motor, Relay
- D. Relay, Motor
Explanation: Neuron 1 is sensory as it carries impulses towards the brain whereas neuron 2 is motor as it carries impulses from the brain to eye.
Correct answer: Sensory, Motor- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In the resting state, potassium ions concentration is higher in the cells, sodium ions concentration is less in the cell and negative ions…
Correct answer: Option A- A. single axon.
- B. single dendron.
- C. multiple dendrites.
- D. multiple nodes of Ranvier.
Explanation: The correct answer is Option B: single dendron. Sensory neurons are distinct because they have a single dendron that conducts impulses…
Correct answer: single dendron.- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: D represents the normal resting membrane potential of -70 mV. A represents depolarization, B represents repolarization and C represents…
Correct answer: Option D- A. Free ribosomes, mitochondria, and lysosomes
- B. Mitochondria, peroxisomes, and Golgi bodies
- C. Lysosomes, peroxisomes, and rough endoplasmic reticulum
- D. Free ribosomes and rough endoplasmic reticulum
Explanation: Nissl granules, also known as Nissl bodies, are found in the cytoplasm of a neuron's cell body and are primarily composed of ribosomes and…
Correct answer: Free ribosomes and rough endoplasmic reticulum- A. They have a single dendron
- B. Their dendrites synapse with receptors
- C. Their dendrites synapse with other neurons
- D. They are present outside the central nervous system
Explanation: Relay neuron synapse with another neuron, facilitating the transmission of electrical or chemical signals.They act as connectors, relaying…
Correct answer: Their dendrites synapse with other neurons- A. Stimulate depolarization
- B. Maintain long-term resting potential
- C. Trigger the release of neurotransmitter
- D. Propagate electric signals in one direction
Explanation: The correct answer is Option B:maintain long-term resting potential.The sodium-potassium pump is crucial for maintaining the resting…
Correct answer: Maintain long-term resting potential- A. Constrict pupils
- B. Contract the bladder
- C. Reduce digestion
- D. Decrease the heartbeat
Explanation: The sympathetic nervous system is responsible for the body's 'fight or flight' response, which prepares the body to react to stressful…
Correct answer: Reduce digestion- A. Several pressure receptors
- B. Numerous differentiated neurons
- C. A network of neurons between ectoderm and endoderm
- D. Several nodes of Ranvier along the length of sensory axons
Explanation: The correct answer is that the hydra's nervous system is characterized by a network of neurons located between the ectoderm and endoderm…
Correct answer: A network of neurons between ectoderm and endoderm- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The correct answer is Option C. During the action potential, the phase where K+ channels open is known as repolarization.
Correct answer: Option C- A. craniosacral outflow
- B. lumbocranial outflow
- C. thoracolumbar outflow
- D. caniothoracic outflow
- E. thoracosacral outflow
Explanation: The correct answer is craniosacral outflow because the parasympathetic nervous system primarily arises from the brainstem (cranial) and…
Correct answer: craniosacral outflow