Human Nervous System

Question 1

Structure of the human nervous system

Answer 1

Central nervous system > Brain
> Spinal cord

Peripheral nervous system > Cranial nerves
> Spinal nerves

Question 2

Explain the voluntary action

Answer 2

Definition: Conscious actions conducted under one’s will
Example: Reading, Peristalsis

Pathway of impulse: Stimulus&raquo_space; Affector (sensory nerves)&raquo_space; Brain&raquo_space; Effector (motor nerves)&raquo_space; Response

Question 3

Explain the involuntary action

Answer 3

Definition:
● Actions that occur immediately without conscious control
● Divided to two sections: medulla oblongata (happen naturally) & spinal cord (need stimulus)

Example:
○ Heartbeat (medulla oblongata)
○ Sneezing when dust enters the nose (spinal cord)

Pathway of impulse: Stimulus&raquo_space; Affector&raquo_space; Effector&raquo_space; Brain

Question 4

Importance of human nervous system in daily life

Answer 4

• Controls and coordinates organs and parts of the body to carry out processes in the body
Example: breathing

• Prevent us from being injured
Example: Temporarily, partially or completely paralysed