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. Nervous system
- B. Brain
- C. Spinal cord
- D. All of above
Explanation: The nervous system connects the brain with the rest of the body through sensory and motor neurons, allowing information to travel in both…
Correct answer: Nervous system- A. Effectors neurons
- B. Receptor neurons
- C. Stimulators
- D. Detector neurons
Explanation: The dorsal root of a spinal nerve carries sensory, or afferent, fibres entering the spinal cord from receptors.
Correct answer: Receptor neurons- A. 10,000,00
- B. 100,000,000
- C. 100,000,000,000
- D. 1000
Explanation: The human brain contains approximately 86 billion neurons, which is commonly rounded in older exam material to about 100,000,000,000…
Correct answer: 100,000,000,000- A. Conduction
- B. Regeneration
- C. Reflex
- D. Movement
Explanation: Regeneration is not a normal defining function of neurons, which are specialized mainly for receiving, conducting and transmitting…
Correct answer: Regeneration- A. 0.03 V
- B. 0.05 V
- C. 0.07 V
- D. 0.09V
Explanation: The resting membrane potential of a typical neuron is about -0.07 V, meaning the inside is approximately 0.07 V more negative than the…
Correct answer: 0.07 V- A. Parkinson's disease
- B. Epilepsy
- C. Alzheimer's discease
- D. Dementia
Explanation: Epilepsy is a convulsive neurological disorder caused by abnormal, excessive electrical activity in the brain, producing temporary motor…
Correct answer: Epilepsy- A. Brain
- B. Spinal cord
- C. Both of these
- D. none of these.
Explanation: The vertebral column encloses and protects the spinal cord, which is part of the central nervous system and carries impulses between the…
Correct answer: Spinal cord- A. Brain
- B. Spinal cord
- C. Both of these
- D. none of these
Explanation: The central nervous system consists of the brain and spinal cord, which together receive, process and coordinate nervous information.
Correct answer: Both of these- A. Na+
- B. K+
- C. Fe
- D. none of these
Explanation: Sodium ions initiate a nerve impulse when voltage-gated sodium channels open and Na+ enters the neuron, causing rapid depolarization of…
Correct answer: Na+- A. Outer surface of neuron is more positive
- B. Inner surface of neuron is more positive
- C. Both of these surfaces are equally positive
- D. none of these.
Explanation: During the resting state, the outside surface of the neuron is relatively positive and the inside is relatively negative because of ion…
Correct answer: Outer surface of neuron is more positive- A. To allow nerve impulse to move in backward direction
- B. To decrease the speed of nerve impulse
- C. To stop the nerve impulse
- D. To provide cytoplasmic connection between neurons.
Explanation: A synapse produces a small synaptic delay because neurotransmitter release and reception take time, so transmission across a synaptic…
Correct answer: To decrease the speed of nerve impulse- A. Transmitters
- B. Synapses
- C. Pores
- D. Nodes
Explanation: The microscopic gap between the ending of one neuron and the next cell is called a synapse, more precisely the synaptic cleft.
Correct answer: Synapses33. Which of the following cytoplasmic extensions carry the message toward the cell body___________?
- A. Dendrites
- B. Axon
- C. Both of these
- D. none of these
Explanation: Dendrites receive signals and carry them toward the cell body, whereas the axon usually carries impulses away from it.
Correct answer: Dendrites- A. Sensory neuron
- B. Motor neuron
- C. Associative neuron
- D. none of these.
Explanation: A sensory neuron typically has one long dendron that carries impulses from a receptor toward the cell body, followed by a relatively short…
Correct answer: Sensory neuron- A. Sensory neuron
- B. Motor neuron
- C. Associative neuron
- D. none of these.
Explanation: In the school-level classification used here, a sensory neuron's dendron is longer than its axon because the receptor may be far from the…
Correct answer: Sensory neuron- A. Sensory neuron
- B. Motor neuron
- C. Associative neuron
- D. none of these.
Explanation: Sensory neurons carry impulses from receptors toward the central nervous system, forming the afferent pathway.
Correct answer: Sensory neuron- A. Ganglia
- B. Longitudinal nerves
- C. Lateral nerves
- D. none of these
Explanation: Planaria has cerebral ganglia, paired longitudinal nerve cords, and transverse lateral connections, giving it a ladder-like nervous…
Correct answer: none of these- A. Nervous system
- B. Endocrine system
- C. Both of these
- D. none of these.
Explanation: Coordination in humans involves rapid electrical control by the nervous system and slower, longer-lasting chemical control by the…
Correct answer: Both of these- A. Brain
- B. Nerves
- C. Neuron-cells
- D. All of these
Explanation: Hydra has a diffuse network of nerve cells, called a nerve net, but it has no brain or central nervous system.
Correct answer: Neuron-cells- A. Muscles
- B. Glands
- C. Sensory organs
- D. Both 'a' & 'b'
Explanation: Effectors are muscles and glands because they produce a response to nerve or hormonal signals, such as contraction or secretion.
Correct answer: Both 'a' & 'b'