How the Nervous System Allows Us to Respond to Changes in Our Environment

The video tutorial explains the nervous system's role in detecting environmental changes and coordinating responses. It covers the central nervous system (CNS) and neurons, detailing how stimuli are detected by receptor cells and converted into electrical impulses. These impulses travel through sensory neurons to the CNS, which coordinates a response via motor neurons to effectors like muscles or glands. The tutorial also describes reflex arcs, highlighting their rapid, automatic nature using the example of pupil contraction in response to increased light intensity.

What are the main components of the central nervous system?

• Neurons and synapses

• Muscles and glands

• Receptor cells and effectors

• Brain and spinal cord

How does the nervous system detect changes in the environment?

• Through motor neurons

• Via neurotransmitters

• With the help of effectors

• By using receptor cells

What is the role of a sensory neuron in the nervous system?

• To produce neurotransmitters

• To act as an effector

• To carry impulses to the CNS

• To form synapses

In a reflex arc, what is the function of a relay neuron?

• To release neurotransmitters

• To connect sensory and motor neurons

• To transmit impulses to effectors

• To detect stimuli

What happens to the pupil of the eye in response to increased light intensity?

• It changes color

• It remains unchanged

• It becomes smaller

• It becomes larger