Science form 2

21,830 views

Published on

0 Comments
8 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
21,830
On SlideShare
0
From Embeds
0
Number of Embeds
58
Actions
Shares
0
Downloads
301
Comments
0
Likes
8
Embeds 0
No embeds

No notes for slide

Science form 2

  1. 1. SCIENCE FORM 2<br />THE WORLD THROUGH OUR SENSES<br />
  2. 2. THE SENSORY ORGANS<br />
  3. 3. Main sensory organs<br /><ul><li>SKIN
  4. 4. NOSE
  5. 5. TONGUE
  6. 6. EAR
  7. 7. EYE</li></li></ul><li>FUNCTION OF MAIN SENSORY ORGANS<br />SKIN<br /><ul><li>Detect touch,pressure, pain, heat, cold.
  8. 8. Organ for touch.</li></ul>NOSE<br /><ul><li>Detect chemicals.
  9. 9. Organ for smell.</li></li></ul><li>TONGUE<br /><ul><li>Detect chemicals.
  10. 10. Organ for taste.</li></ul>EAR<br /><ul><li>Detect sound.
  11. 11. Organ for hearing.</li></ul>EYE<br /><ul><li>Detect light.
  12. 12. Organ for sight.</li></li></ul><li>THE HUMAN NERVOUS SYSTEM<br />♥Responsible for detecting stimuli and changes in the environment and sending the information to the brain for interpretation.<br />♥The brain then send out instructions to the relevant parts of the body for actions to be taken.<br />♥The information and instructions are send out in the form of nervous impulses along nerves.<br />
  13. 13. ♥The nervous system consists of the brain, the spinal cord and the nerves.<br />♥The brain and the spinal cord form the central nervous system.<br />♥The nerves which send nerves impulses from the sensory organs or receptors to the brain are called the sensory nerves.<br />♥The nerves which carry nervous impulses from the central nervous system to the muscles or glands for carrying out the responses are called the motor nerves.<br />
  14. 14. THE PATHWAY FROM STIMULUS TO RESPONSE<br />
  15. 15. THE SENSES OF TOUCH<br />
  16. 16. THE SKIN AS A SENSORY ORGAN<br />
  17. 17. THE SKIN<br />♥The skin is made up of two layers:<br />-the epidermis<br /> -the dermis<br />♥The skin is a sense organ helping the body<br /> to know what is happening in its <br />surroundings.<br />♥The nerve endings or receptors in the skin<br />detects stimuli<br />
  18. 18. THE FUNCTION OF RECEPTORS<br />TOUCH RECEPTOR<br /><ul><li>Detects any contact made with the skin.</li></ul>PRESSURE RECEPTOR<br /><ul><li>Detects pressure exerted on the skin.</li></ul>PAIN RECEPTOR<br /><ul><li>Detects pain when the skin is injured.</li></li></ul><li>HEAT RECEPTOR<br /><ul><li>Detects heat or any that rise in temperature.</li></ul>COLD RECEPTOR<br /><ul><li>Detects a cold substance or any fall in temperature.</li>

×