This document provides information about the nervous system and locomotor system. It discusses the main organs of the nervous system including the brain, spinal cord, and nerves. It describes how the nervous system allows for interaction with the environment through the five senses of touch, hearing, sight, taste, and smell. The document also explains that the locomotor system consists of the skeletal and muscular systems which provide structure, protection, and enable movement.

1. UNIT 1:
INTERACTION

2. 1) NERVOUS SYSTEM
2) LOCOMOTOR SYSTEM
Systems related to interaction

3. 1. THE NERVOUS SYSTEM
ORGANS OF THE NERVOUS SYSTEM
THE BRAIN
When it receives
information it sends
a message to a part
of the body to tell it
how to react.
THE SPINAL CORD
It connects the brain to
the rest of the body.
THE NERVES
They connect the spinal
cord to our muscles,
organs and skin.
-SENSORY NERVES receive
messages from our body
and send them to the
brain.
- MOTOR NERVES transmit
messages from our
brain to our body.

4. CEREBRUM:
It controls the intelligence,
memory, personality,
emotions, feelings…
BRAINSTEM:
It controls the involuntary
movements.
CEREBELLUM:
It controls balance,
movement and
coordination.
THE
BRAIN

5. NERVE CELLS
The nerve cells are called neurones.
They create nerve impulses to transmit
messages from one to another.
CELL BODY: it controls
the neuron and creates
nerve impulses.
AXON:
It transmits the nerve
impulses to other
neurons
Nucleus of the cell body
DENDRITES: They
receive nerve
impulses from
other neurons.
The space
between nerve
cells is called
synapse

6. A) THE SENSE OF TOUCH
Nerve endings detect information about the object
that we touch. They produce nerve impulses that the
sensory nerves transmit to the brain.

7. The skin is made up of three layers:
EPIDERMIS: It protects our skin and gives it colour.
DERMIS: It supports the epidermis and contains many nerve
endings.
FATTY LAYER: It helps us keep warm and provides nutrients
to the other two layers.

8. B) THE SENSE OF HEARING
1. Sound waves go
into your ear and
hit the eardrum.
The eardrum
vibrates.
2. When the
eardrum vibrates,
it makes the small
bones vibrate too.
3. The cochlea detects
the vibrations and
produce nerve
impulses. The auditory
nerves transmit these
impulses to the brain.
The brain interprets
the information.
EARDRUM
AUDITORY NERVE
COCHLEA
SOUND

9. C) THE SENSE OF SIGHT
RETINA: detects light and colours
and send information to the optic
nerve.
OPTIC NERVE: is connected
to the brain. It transmits
information from the retina.
CORNEA: It covers
and protects the
iris and the pupil.
IRIS: The coloured
part of the eye.
PUPIL: a small hole that
lets light into the eye.
LENS: a transparent structure
that focuses light on to the retina.
1. Light goes into
the eye through
the pupil. Then it
passes through
the lens.
2. The lens
projects the image
onto the retina.
3. The optic nerve
transmit the
information to the
brain.

10. D) THE SENSE OF TASTE
Tastebuds
1. Tastebuds
detect the
different flavours
when you eat or
drink something.
2. The tastebuds
producen nerve
impulses and transmit
them to the
gustatory nerves
(inside the tongue)
3. The gustatory
nerves transmit
the impulses to
the brain.

11. E) THE SENSE OF SMELL
OLFACTORY NERVE
OLFACTORY CELLS
1. Smells are made
up of gases in the
air. These gases
go into your nose.
2. The olfactory
cells detect the
gases and send
nerve impulses to
the olfactory
nerve.
3. The olfactory
nerve transmits
the impulses to
the brain.

12. 2. LOCOMOTOR SYSTEM
The locomotor system is made up of two
systems:
- The skeletal system.
- The muscular system.

13. The skeletal
system
The skeletal system
gives us support and
stability. It protects
our vital organs. It’s
made up of bones,
joints and ligaments.
We have 206 bones.

14. The muscular
system allows
us to move.
It’s made up of
muscles and
tendons.
The muscular
system