Introduction to the Nervous System and Neurons

The video provides an overview of the nervous system, explaining its components like the brain, spinal cord, and neurons. It details the roles of sensory receptors, sensory neurons, relay neurons, and motor neurons, highlighting their functions and structures. The video also covers synapses and neurotransmission, emphasizing the direction of impulses and the role of neurotransmitters. Key features of the nervous system are summarized, focusing on its ability to help the body sense and respond to changes.

What are the main components of the central nervous system?

• Neurons and sensory receptors

• Brain and spinal cord

• Brain and neurons

• Spinal cord and neurons

Which sensory organ is responsible for detecting light?

• Skin

• Nose

• Eyes

• Ears

What is the function of dendrites in a sensory neuron?

• Transmit impulses to the brain

• Release neurotransmitters

• Insulate the neuron

• Receive impulses from receptor cells

Where are relay neurons primarily located?

• In the glands

• In the sensory organs

• In the central nervous system

• In the muscles

What is the role of motor neurons?

• To insulate axons

• To transmit impulses between neurons

• To carry impulses to effectors

• To detect stimuli

What happens at a synapse when an impulse reaches the axon terminal?

• The impulse stops

• A neurotransmitter is released

• The neuron contracts

• The impulse reverses direction

Why do synapses slow down neurotransmission?

• Because they are longer than neurons

• Due to chemical diffusion across the gap

• Because they are insulated

• Due to electrical impulses