This document discusses the human senses and nervous system. It describes the organs of sight, smell, hearing, touch, and taste, as well as stimuli, responses, neurons, voluntary and involuntary movements, the skeleton, joints, musculature, and tendons. The nervous system is made up of the central nervous system including the brain and peripheral nerves. Neurons are specialized cells that transmit signals in the nervous system. Voluntary movements are controlled by the brain while involuntary movements are controlled by the spinal cord. The skeleton is composed of bones in the head, trunk, and limbs connected by ligaments and joints. Muscles are attached to bones via tendons and located in the head, trunk, and limbs.

1. SENSITIVITY AND
COORDINATION
BY NOEMI ALMENA CONTRA AND
CLARA HERNANDEZ PEREZ

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

3. • THE SENSES
SIGHT
.The eye is the organ of sight .It is made up of
eyeball and protected by the eyebrows,eyelids
and eyelashes.

4. SMELL
The nose is the organ of smell. The
receptors of smell are in the pituitary
gland,inside he nostrils.

5. 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

6. TOUCH
The skin is the organ of touch. It is made up of
three layers:
.Epidermis
.Dermis
.Hypodermis

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

8. THE NERVOUS SYSTEM
• The nervous system is made up of nerve
centres and nerves.
• The central nervous system:
Brain:
Cerebrum,cerebellum,brain stem

9. NEURONS
Specialised cells called neurons
They are made up of a cell body , dendrites and
axons

10. VOLUNTARY AND INVOLUNTARY
MOVEMENTS
• The brain produces a response in the case of
voluntary movements
Involuntary movements
The spinal cord produces a response in the case
of involuntary movements .
.Sensory nerves .
.The spinal cord.

11. THE SKELETON
• The skeleton is made up of all the bones in the
body:
• Head bones
• Trunk bones
• Limb bones
JOINTS
Bones are connected by resistant fibres called
ligaments.
There are three types:

12. 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
connect muscles to bones .