In the context of cell signaling in neurons, what is the space between a dendrite and an axon called?

• A. Synaptic cleft
• B. Axon hillock
• C. Myelin sheath
• D. Node of Ranvier

Answer: (A)

Verified step by step guidance

1. Understand the context of the question: The problem is asking about the specific space involved in cell signaling between a dendrite and an axon in neurons. This is a fundamental concept in neurobiology.
2. Recall the structure of a neuron: Neurons have three main parts—dendrites (which receive signals), the cell body (soma), and the axon (which transmits signals). The axon of one neuron communicates with the dendrite of another neuron.
3. Identify the key term: The space between the axon terminal of one neuron and the dendrite of another neuron is where neurotransmitters are released to transmit signals. This space is known as the synaptic cleft.
4. Review the other options: The 'axon hillock' is the region where the axon originates from the cell body and is involved in action potential initiation. The 'myelin sheath' is a fatty layer that insulates the axon to speed up signal transmission. The 'Node of Ranvier' is a gap in the myelin sheath that facilitates rapid signal conduction.
5. Conclude that the correct answer is 'synaptic cleft,' as it specifically refers to the space where neurotransmitter-mediated communication occurs between neurons.