UNIT 1 - INTERACTION

stomach

skin

muscles

nose

skeleton

hair

eye

kidneys

lungs

brain

Look at the parts of the body below. Which are associated with the function of interaction? Make a list in your notebook.

UNIT 1

INTERACTION FUNCTION

Locomotor System

Nervous System

Sensory System

involves

REPRODUCTION

NUTRITION

INTERACTION

THREE VITAL FUNCTIONS

HUMANBODY

ENTER CODE

taste bud

neuron

organism

organ

spinal cord

tissue

A _________ is a cell that sends messages to and from your brain

ENTER CODE

taste bud

neuron

organism

organ

spinal cord

tissue

An _________ is a living thing, such as a person, animal or plant.

ENTER CODE

taste bud

neuron

organism

organ

spinal cord

tissue

Cells with similar structures and functions form __________.

ENTER CODE

taste bud

neuron

organism

organ

spinal cord

tissue

An __________ is a part of your body that performs a specific function.

NEXT

UNLOCKED

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Locomotor System

Nervous System

Sensory System

involves

REPRODUCTION

NUTRITION

INTERACTION

THREE VITAL FUNCTIONS

HUMANBODY

TASTE

SMELL

HEARING

TOUCH

SIGHT

The senses

Our sense organs detect information and send electrical signals to the brain.The brain interprets the signals and then decides how to react to the stimulus.

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Nervous System

Sight

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The retina sends electrical signals to the optic nerve. From there, the signals are carried to the brain.

The lens focuses the light on the retina.

The iris controls the size of the pupil and the amount of light that enters the eye.

Light passes through the cornea and enters the eye through the pupil.

PROCESS:

ORGAN: Eyes

Sight

Hearing

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The auditory nerve carries the electrical signal to the brain.

The cochlea detects sound vibrations in the ossicles (three small bones) and it produces electrical signals.

Sound waves enter the outer ear. They go into the auditory canal and they make the eardrum vibrate.

PROCESS:

ORGAN: Ears

Hearing

Smell

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The nerve receptors send electrical signals to the olfactory bulb in the brain.

The chemical particles are detected by nerve receptors inside the nose.

Chemical particles in the air enter the nose through the nostrils.

PROCESS:

ORGAN: Nose

Smell

Taste

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Electrical signals are carried to the brain by gustatory nerves.

The taste buds have receptor cells that detect tastes.

Food touches the tongue, wich is covered with taste buds.

PROCESS:

ORGAN: Tongue

Taste

Touch

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The nerves send electrical signals to the brain.

The dermis contains nerves. These nerves detect heat, pressure and texture.

The skin covers and protects your body. The top layer is the epidermis and the middle layer is the dermis.

PROCESS:

ORGAN: Skin

Touch

Brain stem

Cerebellum

Cerebrum

PeripheralNervous System

Motor neurons

Sensory neurons

Spinal Cord

The Nervous System

The nervous system carries messages between the brain and other systems of the body.

CentralNervous System

Brain

Nervous System

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SpinalCord

Brain

Central Nervous System

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Types of neurons

These nerves are made up of tiny cells called neurons that transmits electrical signals.

The peripheral nervous system is made up of nerves.

Peripheral Nervous System

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Types of neurons

These nerves are made up of tiny cells called neurons that transmits electrical signals.

The peripheral nervous system is made up of nerves.

Peripheral Nervous System

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Brain

Motor neurons

Sensory neurons

LOCOMOTOR SYSTEM

SENSORYSYSTEM

Muscles

The Skeleton

The signals from the brain travel through the nervous system to our muscles and they move our bones and joints. All these parts together form the locomotor system.

Locomotor System

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JOINTS

FIXED

FLEXIBLE

SEMI-FLEXIBLE

BONES

SHORTBONES

FLAT BONES

LONGBONES

The skeleton has 206 bones that are connected by joints.

The Skeleton

In this unit we are not going to learn all of them!

Click on the pictures to find out more information.

Cardiac muscles make the heart move and beat. They are involuntary muscles.

Smooth muscles are found in organs like the stomach. They are involuntary muscles.

Skeletal muscles are joined to bones by tendoms. They are voluntary muscles, we can control them.

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The human body has more than 600 muscles. The nervous system controls these muscles. There are three types of muscles.

Muscles