Question

A chemical signal is transmitted across a synapse from

• A. Dendrite end of one neuron to axon end of the next neuron
• B. Axon end of one neuron to dendrite end of the next neuron
• C. Dendrite to cell body of the same neuron
• D. Cell body to axon of the same neuron

Answer 1

The correct option is B Axon end of one neuron to dendrite end of the next neuron

A neuron or the nerve cell has four distinct parts (or regions). The first part is the cell body (or soma). This is not only the metabolic "control center" of the neuron, it is also its "manufacturing and recycling plant." (For instance, it is within the cell body that neuronal proteins are synthesized.) The second and third parts are processes structures that extend away from the cell body. Generally speaking, the function of a process is to be a conduit through which signals flow to or away from the cell body. Incoming signals from other neurons are (typically) received through its dendrites. The outgoing signal to other neurons flows along its axon. A neuron may have many thousands of dendrites, but it will have only one axon. The fourth distinct part of a neuron lies at the end of the axon, the axon terminals. These are the structures that contain neurotransmitters. Neurotransmitters are the chemical medium through which signals flow from one neuron to the next at chemical synapses.

Therefore, the correct answer is option B.