Human nervous system

Question 1

what is the function of the nervous system

Answer 1

the nervous system allows the body to react to its surroundings and coordinate their behaviour

Question 2

how does a stimulus lead to a response being carried out by the body

Answer 2

.stimulus is converted into an electrical impulse by receptors

.the electrical impulses passes along sensory neurons to the central nervous system

Question 3

what sequence of events describes how the nervous system works

Answer 3

stimulus-receptor-coordinator-effector-response

Question 4

what is a reflex action

Answer 4

a reflex action is an automatic and rapid response without conscious thinking of the brain

Question 5

why are reflex actions important

Answer 5

reflex actions prevents harm to the body

Question 6

describe how a reflex action occurs via a reflex arc

Answer 6

.the stimulus is detected by a receptor

.an electrical impulse passes along a sensory nuerone to the spinal cord

.at a synapse between a sensory nuerone and a relay nuerone, a chemical diffuses across the gap and stimulates a new impulse which passes along the relay nuerone

.the same process occurs at a synapse between a relay nuerone and a motor nuerone

. at the effector, an appropriate response is carried out
.

Question 7

what is the difference between a reflex pathway and a counscious pathway

Answer 7

within a reflex pathway, the coordination centre is a relay nuerone found in the spinal cord parts of the brain.
In a counscious pathway, the coordination centre is in the conscious part of the brain.