Read the below statements about synaptic transmission:
1. Synaptic cleft is the gap between two neurons.
2. Neurotransmitters are released from presynaptic terminals.
3. Axon hillock receives impulses from the next neuron.
Which of the above statements are correct?
Show answer & explanation
Correct answer: A
Explanation
Correct Answer: Option 1 (Only 1 and 2 are correct)
Explanation:
The following statements are analyzed:
Statement 1 is correct: The synaptic cleft is the tiny space or gap between two neurons where electrical impulses are converted into chemical signals and transmitted to the next neuron.
Statement 2 is correct: Neurotransmitters (such as dopamine or serotonin) are released from the terminals of the axon of the presynaptic neuron.
Statement 3 is incorrect: The axon hillock is the region where the axon originates from the cell body and where the impulse is generated and propagated. The function of receiving impulses from the next neuron is performed by dendrites, not the axon hillock.
Additional Facts:
Dendrites: These are branch-like structures of the neuron that receive signals from other neurons.
Synapse: The junction of the presynaptic neuron, synaptic cleft, and postsynaptic neuron is collectively called a synapse.
Electrical vs. Chemical: Signals travel electrically within a neuron, but between two neurons (at the synapse) they are transferred chemically.
Possible questions for upcoming exams:
Which part of the brain is responsible for maintaining body balance?
(Answer: Cerebellum)
What are the chemical messengers that carry signals between neurons called? (Answer: Neurotransmitters)
What is the longest cell in the human body?
(Answer: Nerve cell or neuron)