Synapse is the point at which a nervous impulse passes from:

Correct option is D

• A synapse is the junction between two neurons, where a nervous impulse is transmitted from one neuron to the next. This can occur through either electrical or chemical signals, involving neurotransmitters that carry the signal across the synaptic gap.

• The synapse plays a critical role in the functioning of the nervous system by allowing communication between neurons, enabling the transmission of signals throughout the body, and facilitating processes like reflexes, thoughts, and movement coordination.

• One epithelial cell to another: Epithelial cells are part of tissues and do not directly involve synapses.
• One endocrine gland to another: Endocrine glands secrete hormones, which are part of the endocrine system, not directly related to synapses.
• The brain to the spinal cord: This is the connection of the central nervous system but not the definition of a synapse.