2. The funcion of sensitivity is to producea response to a estimulus we
receive
A estimulus is anything you see,hear,tuch,smell or tate.
They can be:Internal or external:
Internal stimuly came from inside our bodies like felling or thirst.
• External stimuly came fron outside our bodies,like the smell of a cake
or the texture of a jumper.
The body as different receptors to recive different types of a stimuly.
• Internal receptors:recive the internal stimuli our bodies produce.They
are all over aroun the bodie.They let us feel hunger or pain.
External receptorsrecive external stimuli.They are on the sensory organs.
The eyes,the nose,the tongue,the ears and the skin.

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

4. RESPONSES
A response is the body`s answers to a stimulus.
There are two tipes of responses,muscular and glandular.
Muscular respons are the movments our muscles make in responseto a stimulus.
Glandular responses occur when glands produce various substances in response to a
stimulus.For example,your sweat glands produce sweat in response to heat.

5. SIGHT
The eye is the organ of sight.It
is made up of the eyeball
and protected by the
eyebrows,eyelids and
eyelashes.
1. Light goes through the
cornea .
2. Ligth passes through the
pupil the opening of the iris.
3. Ligth passesthrough the
lenses which focuses the
image in the retina.
4. The information in theretina
travels to the brain through
optic nerve.

6. The nose is the organ of smell.The receptors of smell are in the pupitary
gland,inside the nostrils.

7. The ear is the organ of hearing.It has three
parts:The outer ear,the middle ear and the
inner ear.
• The outer ear includes the ear and the ear
canal.
• The middle ear incudes the eardrum and the
small bones.
• The inner ear includes the cochlea and the
auditory nerve
1. The outer ear recives sounds.
2. The middle ear changes sounds into vibrations.
3. The inner ear changes vibrations into nerve
impulses that go tothe brain.

8. The tounge is the organ of tate.The receptors of taste are in the
taste buds,all are around the tounge

9. The nervous system is made up of nerve centers and nervs.
•Nerve centers interpret the information and develop responses,forming the central nervous system.
•The central nervous system has two parts:
_ The brain is inside the skull. Is made up of the cerebrum,the cerebelum and the brain stem.
_The spinsal cord is made up of many neurons.Is protedted by vertebrae.
•The peripheral nervous system is made up of :
_Sensory nerves, which transmit information from the sensory and internal organs t the central
nervous system
_Motor nerves,wihch transmit responses from the central nervous system to the muscles and glands.
Both the central and peripheral nervous system are made up of specialiced cells called neurons.
They are made up of a cell bodye,dendrites and axons.
Neurons recive information from other neurons through dendrites and transmit through the axons.

10. Is in charge of carrying muscular responses created by the nevous system
It is made up of the skeleton and the musculature
THE SKELETON
It is made up of all the bones in
the body
•Head bones : skull bones and
facial bones
•Trunk bones : spine and the rib
cage.
•Linb bones : upper in the arms
and lower in the legs.

11. JOINTS
Are located where two or more bones meet.
Bones are connected by resistant fibres called ligaments .
There are three types of joints
•Moveable joints : elbow
•Semi-moveable jointsn : vertebrae
•Fixed joints : the skull

12. Locomotor muscles are conected to the
bones.When we contract or relax, they
move the bones
HEAD MUSCLES:
•Masseter to chew food .
•Buccinator to open and close our lips.
•Orbicular to open and close our eyes.
TRUNK MUSCLES:
•Sternocleidomastoid yo move our head.
•Abdominal and pectoral to bent our trunk.
•Intercostal to move our ribs.
•Trapezius to connect our head and
shoulders to our back.
•LIMB MUSCLES
•Biceps triceps and deltoid in the arm
•Quadriceps gluteous and calf muscles in
the leg

13. Tendons are made of flexible and fibrous tissue.
They connect muscles to bones .
They cannot contact or relax like muscles.