unit 3 nervous system

unit 3the nervous system and the senses

science claret

index

ViDEOs

interaction

nerve cells

brain

spinal cord and nerves

index

touch

sight

smell

hearing

videos

taste

Videos

Interaction

We interact using:

1. Our senses
2. Nervous system
3. Locomotory system

Process of interacction

• Our senses tell us What's Happening
• The information travels along the sensory nerves to the brain
• The brain receives the info, processes it and responds with the nerves, muscles or glands

NERVE CELLS

the nerve cells

THE BRAIN

CEREBRUM: Largest and more complex part of the brain. It controls our intelligence, memory, personality, emotions, ability to feel and move. CEREBELLUM: It is the responsable of balance and coordination. BRAINSTEM: It connects the brain with the spinal cord. It controls involuntary actions (Breathing, heartbeat...)

Tne brain coordinates the nervous system and controls all of the body's activity. It has 3 parts

Spinal cord and nerves

spinal cord and nerves

Spinal cord

It connects the brain with the body. It's a thick tube made up by nerve tissue.

Nerves

Sensory nerves

Motor nerves

They connect the spinal cord to the muscles. Whe have two types:

Receive messages from the environment and send them to the brain

Transmit messages from the brain to muscles and glands

THE 5 senses

Videos

touch

Videos

touch

• Nerve endings detect information (temperature, texture, shape) of the things we touch.
• They produce nerve impulses and the sensory nerves send them to the brain.
• The skin has 3 different layers:

+ info

sight

Videos

PARTS OF THE EYE

Tempor Labore

how do we see?

1. Light goes into the eye through the pupil. Then it passes through the lens
2. The lens proyects an upside-down image onto the retina. This information is sent to the optic nerve.
3. The optic nerve transmits the information to the brain,

smell

Videos

• Smells are made up of gasses in the air. When air goes into the nose, the gases are detected by the olfatory cells.

• They send the nerve impulses to the brain through the olfatory nerve.

hearing

Videos

Process of hearing

1. Sound waves go into the ear and hit the eardrum. It vibrates too
2. The eardrum vibration makes the small bones (" yunque, martillo and estribo") vibrate too.
3. The vibration of the small bones is detected by the cochlea and it produces nerve impulses. That impulses are transmitted by the auditory nerve to the brain,

taste

Videos

TASTE

• Our tongue can detect 4 tastes: SWEET, SALTY SOUR AND BITTER
• They are combined with smells and combined in the brain make us feel FLAVOURS

• In our tongue we have tiny pink bumps that are called TASTE BUDS
• They detect chemicals in food. When food is mixed with saliva the taste buds detect them.
• They produce a nerve impulse which is sent to the gustatory nerve which transmits the info to the brain

thank u!