Grade 9 Nervous System

What is the role of the nervous system?

• removal of unused substances and waste

• coordination and regulation of body function

• nutrients delivery and picking up waste

• oxygen and carbondioxide exchange

Brain and spinal cord are considered ...

• central nervous system

• peripheral nervous system

Which one shows the characteristics of reflex action?

• voluntary and rapid

• automatic and slow

• voluntary and slow

• automatic and rapid

Which one is an example of reflex action?

• A boy takes a note when reading a book.

• A girl runs because she is afraid of a cockroach.

• A boy takes his hand away when touching a hot pan.

• A girl wakes up from her sleep because of a loud sound.

Which components of reflex arc are considered peripheral nervous system? (choose 2)

• Sensory neurone

• Motor neurone

• Relay neurone

Which component of reflex arc detects the stimuli from external or internal environment?

• Relay neurone

• Motor neurone

• Receptor

• Effector

Which part of reflex arc transmits signal from receptor to relay neurone?

• sensory neurone

• motor neurone

Which component of reflex arc carries signal from relay neurone to the effector?

• sensory neurone

• motor neurone

which component of reflex arc produce the appropriate response/ action?

• effector

• receptor

• relay neurone

• motor neurone

Draw a reflex arc