BY:PAULA FERNÁNDEZ PRIETO UNIT 2 SENSITIVITY AND COORDINATION
May 25, 2015
BY:PAULA FERNÁNDEZ PRIETO
UNIT 2SENSITIVITY AND COORDINATION
STIMULIA stimulus is anything you see,touch,smell or taste
Stimuli can be: Internal stimuli External stimuli
RECEPTORS The body has different receptors to receive different types of stimulus.
Internal receptors External receptors
RESPONSE A response is the body answer
to a stimulus.
There are two different types of responses:
Muscular response Glandular response
SIGHT
The eye is the organ of sight
SIGHT (2) First light goes throught
the cornea
Then light passes throught the pupil,the opening of the iris.
After that light passes throught the lens wich focuses the image on the retina
Finally in the retina travels to the brain throught the optic nerve.
SMELL The nose is the organ of smellThe receptors of smell are in the pituitary gland,inside the nostrils
nostrils
HEARINGThe ear is the organ hearing The outer ear includes the ear
and ear canal The middle ear includes the
eardrum and the small bones The inner ear includes the
cochlea and the auditory nerve
HEARING (2) 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
TOUCH AND TASTEThe skin is the organ of touch.
It is made up of three layers.
Te tonge is the organ of taste.
The receptors of taste are in the taste buds
THE NERVOUS SYSTEMThe nervous system is made up of nerve centers and nerves.
Nerve centers intrerpret the imformation and develop response,forming the central nervous system.
PARTS OF CENTRAL NERVOUS SYSTEM
The central nervous system has two different parts:
The brain is inside the skull.it is made up of the cerebrum,the cerebrellum and the brain stem
The spinal cord is made up of many neurons and it is protect by vertebrates.
PARTS OF PARIPHERAL NERVOUS SYSTEM
The pariphetal nervous system has two different parts:
Sensory nerves Motor nerves
NEURONSBoth the central and peripheral nervous system are made up of specialised cells called neurons.
cell body axons dentrites
VOLUNTARY AND INVOLUNTARY MOVEMENTS
Our bodies react to stimuli making voluntary or involuntary movements.
Voluntary movements:the brain produces a response in the case of voluntary movements.
Involuntary movements:the spinal cord produces a response in the case of involuntary movements.
THE SKELETONThe skeleton is made up of all the bones
of the body. Head bones: skull bones and facial bones Trunk bones : spine and rib cage Limb bones: upper limb bones and lower limb
bones
THE MUSCULATURE The musculature is the set of muscles in the
body Head muscles: masseter,buccinator and orbicular Trunk muscles:
sternocleidomastoid,abdominal,pectoral,intercostal,trapezius
limb muscles:
bicep,tricep,deltoy,quadriceps,gluteus,calf muscles.