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Sensitivity and coordination by María
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Sensitivity and coordination by María


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  • 1. Unit 2 sensitivity andcoordination Maria boizas
  • 2. Stimuli A stimulus is anything you see,hear,touch,smell or taste.  There are two types of stimuli:  Internalstimuli  External stimuli
  • 3. The smell of a flower is an externalstimuli.
  • 4. receptors Thereare two types of receptors: Internal receptors External receptors
  • 5. Responses A response is the body’s answer to a stimulus  There are two different types of responses:  Muscular responses  Glandular responses
  • 6. Chewing is a muscular response
  • 7. The senses
  • 8. sight The eye is the organ of sight. it is made up of the eyeball and protected by the eyebrows,eyelids and eye lashes.
  • 9. Process of sight  First light goes through the cornea.  Then light passes through the pupil,the opening of the iris.  After that light passes through the lens with focuses the image on the retina.  The information in the retina travels to the brain through the optic nerve
  • 10. smell Thenose is the organ of smell.The receptorsof smell are in the pituitary gland,inside the nostrils.
  • 11. hearing The ear is the organ os hearing. It has three parts:  The outer ear  The middle ear  The inner ear
  • 12. The process of hearing  First the outer ear receives sounds  Then the middle ear changes sounds into vibrations.  Finally the inner ear changes vibrations into nerve impulses that go to the brain
  • 13. touch The skin is the organ of touch. It is made up of three layers:  Epidermis  Dermis  Hypodermis
  • 14. taste The tongue is the organ of taste. The receptors of taste are in the taste buds. There are taste buds all around the tongue.
  • 15. The nervous system The nervous system is made up of nerve centres and nerves.
  • 16.  The peripheral nervous system is made up of:  Sensory nerves  Motor nerves The central nervous system has two parts:  The brain  The spinal cord
  • 17. neurons They are made up of a cell body,dendrites and axons. Neurons receive information from other neurons.
  • 18. Voluntary and involuntarymovements Ourbodies react to stimuli making voluntary or involuntary movements.
  • 19. Voluntary movements  When we see the clouds our sensory nerves inform the brain about this.  Our brain processes the information and produces a response.  Our motor nerves transmit a response to the muscles.
  • 20. Involuntary movements  The spinal cord produces a response in the case of involuntary movements.  Sensory nerves transmit information about involuntary movements to the spinal cord.  The spinal cord produces a very fast response.
  • 21. The skeletal system  Theskeletal and muscular system is in charge of carrying muscular responses created by the nervous is made up of the skeleton and the musculature.
  • 22. The skeleton  The skeleton is made up of all the bones in the body.  Head bones:skull bones and facial bones.  Trunk bones:spine and rib cage.  Limb bones:there are two groups the upper limb bones and the lower limb bones.
  • 23. joints  The joints are located where two or more bones meet.Bones are connected by ligaments.  There are three types of joints:  Moveable joints  Semi-moveable joints  Fixed joints
  • 24. The musculature  The musculature is the set of muscles in the body.locomotor muscles are conected to the bones.when they contract or relax,they move the bones.  Head muscles:masseter,buccinator and orbicular.  Trunk muscles:sternocleidomastoid,abdominal, pectoral,intercostal and trapezius.  Limb muscles:biceps,triceps,deltoid,quadriceps, gluteus and calf muscles. .
  • 25. The end