Unit2 sensitivity and coordination noemi and clara s

SENSITIVITY AND COORDINATION

BY NOEMI ALMENA CONTRA AND CLARA HERNANDEZ PEREZ

STIMULUS AND RESPONSES

STIMULI A stimulus is anything you see, hear,touch, smell or taste..Internal stimuli.External stimuli.Internal receptors.External receptors RESPONSESA response is the body´s answer to a stimulusThere are two types:.Muscular responses.Glandular responses

•THE SENSES SIGHT.The eye is the organ of sight .It is made up of

eyeball and protected by the eyebrows,eyelids and eyelashes.

SMELLThe nose is the organ of smell. The

receptors of smell are in the pituitary gland,inside he nostrils.

HEARING

• The ear is the organ of hearing. It has three parts :• 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

TOUCH

The skin is the organ of touch. It is made up of three layers:

.Epidermis

.Dermis

.Hypodermis

TASTE

.The tongue is the organ of taste.The receptors of taste are in the taste buds.

THE NERVOUS SYSTEM• The nervous system is made up of nerve

centres and nerves.• The central nervous system:Brain:Cerebrum,cerebellum,brain stem

NEURONS

Specialised cells called neuronsThey are made up of a cell body , dendrites and axons

VOLUNTARY AND INVOLUNTARY MOVEMENTS

• The brain produces a response in the case of voluntary movements

Involuntary movementsThe spinal cord produces a response in the case

of involuntary movements ..Sensory nerves ..The spinal cord.

THE SKELETON

• The skeleton is made up of all the bones in the body:

• Head bones• Trunk bones• Limb bones JOINTSBones are connected by resistant fibres called

ligaments.There are three types:.Moveable joints .Semi – moveable joints.Fixed joints

THE MUSCULATURE• The musculature is the set of muscles in the body:• Head muscles.• Trunk muscles.• Limb muscles. TENDONSTendons are made of flexible and fibrous tissue. They

connect muscles to bones .