The document summarizes the key human body systems including: 1) The sensory organs (eyes, ears, nose, tongue, skin) and how they receive stimuli from the environment and transmit messages to the brain. 2) The nervous system, made up of the central nervous system (brain and spinal cord) and peripheral nervous system, which interprets sensory messages and coordinates responses. 3) The skeletal and muscular systems, with bones providing structure, joints allowing movement, and muscles enabling movement when signaled by the nervous system.

2. A stimulus is anything you see,hear,touch,
smell or taste.
Stimuli can be internal o external:
Internal stimuli and external stimuli.
The boy has different receptors to receive
different types of stimuli.
Internal receptors and external receptors.

3.  A response is the body´s answer to a stimulus.
 There are two types of responses, muscular and glandular.
 Muscular responses and glandular responses.

4. 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) Light passes through the pupil.
3) Light passes through the lens which focuses the image on the retina.
4) The information in the retina travels to the brain through the optic nerve.

5.  The nose is the organ of smell.The receptors of smell are in
the pituitary gland , inside the nostrils.

6.  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.
1) the outer ear receives sounds .
2) The middle ear changes sounds into vibrations.
3) The inner ear changes vibrations into nerve impulses that go
to the brain.

7.  The skin is the organ of touch.It is made up of three layers.
Epidermis.
Dermis.
Hypodermis.

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

9.  The nervous system is made up of nerve centres and nerves.
 Nerve centres interpret the information and develop
responses, forming the central nervous system.
 The central nervous system has two 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, it is protected by vertebrate.
 The peripheral nervous system is made up of :
 sensory nerves and motor nerves.

10.  Both the central and peripheral nervous systems are made up
of specialised cells called neurons.
 Are made up of a cell body, dendrites and axons.

11.  Our bodies react to stimuli making voluntary or involuntary
movements. The brain produces a response in the case of
voluntary movements
 The spinal cord produces a response in the case of
involuntary movements.

12.  The skeletal and muscular system it is made up of the
skeleton and the musculature.
 The skeleton is made up of all the bones in the body.
 Head bones.There are two groups ,skull bones and facial
bones.
 Trunk bones.there are two groups the spine and the rib cage.
 Limbs bones.there are two groups, the upper limbs bones and
the lower limbs bones.

13.  The joints are located where two oe more bones meet.
 There are three types of joints:
 Moveable joints, semi-moveables and fixed joints.

14.  The musculature is the set of muscles in the body
Head muscles
 We use the masseter muscles to chew food.
 We use the buccinator.
 We use the orbicular.
Trunk muscles
 We use the sternocleidomastoid.
 We use the abdominal and pectoral.
 We use the intercostal.
 We use the trapezius.
Limb muscles
 We use the biceps to bend the arm,the triceps to lower it and
the deltoid.
 We use the quadriceps to extend the leg,the gluteus to move
it, and the calf muscles to extend the feet.

15.  Tendons are made up of flexible and fibrous tissue. They
connect muscles to bones.