What are Nerve Cells, Neurons & Synapses?

The video explains the nervous system as a communication network, detailing the roles of sensory, relay, and motor neurons. It covers neuron structure, including cell bodies, dendrites, and axons, and describes how synapses transmit signals. The video concludes with a summary of neuron types and synapse functions.

What is the primary role of sensory neurons in the nervous system?

• To carry signals from the central nervous system to effectors

• To detect stimuli and send messages to the central nervous system

• To connect different parts of the central nervous system

• To secrete hormones in response to signals

Which type of neuron is responsible for carrying messages within the central nervous system?

• Sensory neurons

• Motor neurons

• Relay neurons

• Effector neurons

What is the function of the insulating sheath surrounding axons?

• To store neurotransmitters

• To speed up the conduction of nerve impulses

• To slow down nerve impulses

• To protect the neuron from damage

How do synapses ensure that nerve signals travel in one direction?

• By using motor neurons to control direction

• By releasing neurotransmitters that bind to receptors on the next neuron

• By having a physical barrier that blocks reverse signals

• By using electrical impulses only

What happens when an electrical impulse reaches a synapse?

• It causes the neuron to secrete hormones

• It directly jumps to the next neuron

• It triggers the release of a neurotransmitter

• It stops and does not continue