Nervous system Part 2

Front

What is the role of light receptors in the eyes during a reflex action?

Back

Light receptors detect visual stimuli, such as a football flying towards your head, triggering a reflex response.

Front

In which direction do action potentials travel?

Back

Action potentials travel in one direction along the neuron.

Front

What is a stimulus in the context of a reflex arc?

Back

A stimulus is an event or object that triggers a response, such as a ball flying at your head.

Front

What is required for an action potential to cross a synapse?

Back

A neurotransmitter is required to transmit the action potential across the synapse.

Front

Define a reflex action.

Back

A reflex action is an involuntary and nearly instantaneous movement in response to a stimulus.

Front

What is the function of neurotransmitters?

Back

Neurotransmitters are chemicals that transmit signals across a synapse from one neuron to another.

Front

What is the difference between a receptor and an effector in the nervous system?

Back

A receptor detects stimuli, while an effector (like muscles) carries out the response.

Front

What is the significance of the reflex arc?

Back

The reflex arc is a neural pathway that controls reflex actions, allowing for quick responses to stimuli.

Front

What happens to the body during a reflex action?

Back

The body responds automatically to a stimulus without conscious thought, often to protect itself.

Front

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

Back

Sensory neurons transmit sensory information from receptors to the central nervous system.