Question

Which is not true of a synapse?

• A. Neurotransmitters affect postsynaptic neurons
• B. Two neurons may be involved
• C. A synaptic cleft separates the neurons of the synapse
• D. Neurotransmitters are released from dendrites

Answer 1

The correct option is D

Neurotransmitters are released from dendrites

The correct option is D:

Explanation of the correct option :

Neurotransmitters are released from synaptic vesicles in presynaptic neurons in response to neural activity, diffuse across the synaptic cleft, and bind specific receptors in order to bring about changes in postsynaptic neurons. Which makes option D not to be true.

Explanation of the incorrect option:

Option A:

.After release into the synaptic cleft, neurotransmitters interact with receptor proteins on the membrane of the postsynaptic cell, causing ionic channels on the membrane to either open or close which makes option A be true

Option B:

Two neurons are needed and involved which makes option B to be true.

Option C:
The extracellular space between two neurons is known as synaptic cleft which makes option C true.

Final answer: Option D is incorrect because neurotransmitters are released from synaptic vesicles, not from the dendrites.