1. Alfredo Iglesias Martín

2. • Stimulus and response.
• The senses.
• What is the nervous system ?
• Voluntary and involuntary movements.
• The skeletal and muscular system.

3.  STIMULI.
A stimulus is anything you see, hear, touch,
smell or taste;
Stimuli can be:
• Internal stimuli.
• External stimuli.
The body has different receptors :
• Internal receptors.
• External receptors.
 RESPONSES.
A response is the body´s answer tu a sitimulus.
There are two types of responses:
• Muscular responses.
• Glandular responses.

4.  THE SIGHT.
The eye is the organ of sight. It is made up of the eyeball and protected by the eyebrows, eyelids
and eyelashes.
Light passes The information in
through the lens the retina travels
which focuses the to the brain
image on the through the optic
retina. nerve.
Light passes
through the pupil,
the opening of the
iris.
Light goes
through the
cornea

5.  THE SMELL.
The nose is the organ of smell. The receptors of smell are in the pituitary
gland, inside the nostrils.
Pituitary

6.  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 erdrum and the samall bones.
• The inner ear includes the cochlea and the auditory nerve.
The inner ear
changes
vibrations into
nerve impulses
that go to the
brain.
The middle ear
changes sounds
The outter ear
into vibrations.
receives sounds.

7. THE TOUCH. THE TASTE
The skin is the organ of The tongue is the organ of
touch. It is made up of taste. The receptors of
three layers. taste are in the taste
- Epidermis. buds.
- Dermis.
- Hypodermis.
Taste buds.

8.  THE NERVOUS SYSTEM.
The nervous system is made up of :
• The central nervous system.
- Brain, cerebrum, cerebellum
and brain system.
- Spinal cord.
• The peripheral nervous system:
- Sensory nerves.
- Motor nerves.
 NEURONS.
They are made up of a cell body, dendrites and axons.

9. Our bodies react to stimuli making voluntary or involuntary movements.
 VOLUNTARY MOVEMENTS.
 INVOLUNTARY MOVEMENTS.
The spinal cord produces a response
in the case.

10.  SKELETAL SYSTEM.
• THE SKELETON.
- Head bones.
- Trunk bones.
- Limb bones.
• JOINTS.
- Moveable joints.
- Semi moveable joints.
- Fixed joints.

11.  THE MUSCULATURE.
The musculature is the set of muscles
in the body.
• Head muscles.
• Trunk muscles.
• Limb muscles.
 TENDONS.
Tendons are made of flexible and fibrous
tissue. They conect muscles to bones.