FORM 2CHAPTER 1

THE WORLD THROUGH

OUR SENSES

1.1: THE SENSORY ORGAN

What is sensory organ?

Sensory organ is a part of the body which can detect the surroundings and send the information to the brain.

SENSORY ORGANS AND THEIR FUNCTION

SENSORY ORGANS

STIMULI DETECTED MAIN FUNCTIONSENSORY ORGAN

Touch, pressure, heat, cold, pain

Chemicals

Chemicals

Sound

Light

Organ for touch

Organ for smell

Organ for taste

Organ for hearing

Organ for sight

How our sense organ can protect us from harm or injury????

HUMAN NERVOUS SYSTEMNERVOUS SYSTEM

Central nervous system Nerves

Brain Spinal cord Sensorynerves

Motornerves

Central nervous system

Brain

Spinal cord

Nerves

When a stimulus stimulated the receptors, receptors will send out a nervous impulse along the nerves to the brain.The brain interprets the impulse and recognise the stimulus.The impulse is send to the effector (muscle) to do action / response.

Pathway from stimulus to response

Stimulus Sensoryorgan

Sensory nerves

BrainMotor nerves

Response

: impulse

Sensorynerve

Motor nerve

Central nervous system(brain/spinal cord)

Pathway from stimulus to response

Stimulus Sensoryorgan

Sensorynerves

BrainMotornerves

Response

: impulse