SENSITIVITY AND COORDINATION
STIMULUS AND RESPONSES
Stimulus is anything you see,hear,touch, smell or taste . Can be :
• Internal stimuli.• External stimuli. The body has different receptors .• Internal receptors • External receptors
RESPONSES A respose is the body’s answer to a
stimulus. There are two types:• Muscular responses• Glandular responses
THE SENSES : SIGHT
The eye is the organ of sight. Is made up of the eyeball and protected by the eyebrows, eyelids and eyelashes.
Process : 1. First light goes through the cornea
cornea. 2. Then light passes through the
pupil pupil. 3. After that light passes through the lens. 4. Finally information in the retina
retina travels to the brain trough through the optic nerve .
SMELL The nose is the organ of smell.the
receptors of smell are in the pituitary gland inside the nostrils.
The parts are nostrils and pituitary glands.
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.
HEARING
• PROCESSES:• 1.The outer ear receives sounds.• 2.The middle ear changes sounds into vibration
vibrations. 3.The inner ear changes vibrations intointo nerve impulses that go to thebrain.
PARTS:Ear,ear canal ,eardrum,smallbones,auditory nerve,cochlea.
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TOUCH
The skin is the organ of touch. It is made up of three layers.
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.
Nerves centres interpret the information and develop responses, forming the central nervous system.
The central nervous system has two parts:• The brain inside the skull. It is made up of the
cerebrum, the cerebellum and the brain stem.• The peripheral nervous system is made up of: Sensory nerves. Motors nerves.
NEURONS
Both the central and peripheral nervous systems are made up of specialised cells called neurons.
They are made up of a cell body, dendrites and axons.
VOLUNTARY AND INVOLUNTARY MOVEMENTS
VOLUNTARY MOVEMENTS: The brain produces a response in the
case of voluntay movements.INVOLUNTARY MOVEMENTS:The spinal cord produces a response in the case of involuntary movements.
THE SKELETON
HEAD BONESTEMPORAL, OCCIPITAL, PARIETAL, FRONTAL.FACIAL BONES: NASAL, CHEEKBONE,JAWBONE.
TRUNK BONESSTERNUM,RIBS, SPINE,HIPBONE
LIMB BONESUPPER LIMBS BONESCLAVICLE, SCAPULA, HUMERUS, ULNA,RADIUS,CARPAL, METACARPAL, PHALANGES.
LOWER LIMBS BONESFEMUR, METATARSAL ,PHALANGES,TARSAL, FIBULA, TIBIA.
JOINTS
The joints are located where two or more bones meet.there are three types of joints:• Moveable joints.• Semi-moveable joints.• Fixed joints.
MUSCULATURE
TENDONS
Tendons are made of flexible and fibrous tissue. They connect muscles to bones.
THE ENDPATRICIA SESMA LUCIA MARTIN TERESA ORTEGA
LAURA PRIETO
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