Download Body Systems

BODY SYSTEMS
THE DIGESTIVE SYSTEM
THE DIGESTIVE SYSTEM
The function of the digestive system is to break-down food into nutrients.
DIGESTIVE SYSTEM
What do you think
are the organs in the
digestive system?
outh
M_______
Breaks us food by chewing
and mixing it with saliva.
esophagus
O__________
Food moves down this pipe
tomach
S________
Mixes food with acid and
breaks it down more
mall I________
ntestine
S____
This is where nutrients are
absorbed into the blood
stream
arge I________
ntestine
L____
Here water is absorbed from
the food
ectum
R______
Food leaves the body
through the rectum
THE RESPIRATORY SYSTEM
THE RESPIRATORY SYSTEM
Look at the picture. What do you think the respiratory system is used for?
RESPIRATION
Respiration is a process that happens in cells.
It uses oxygen and sugar (glucose) and changes it into energy which our body
uses.
The waste products of respiration are carbon dioxide and water.
THE RESPIRATORY SYSTEM
You can breathe oxygen in through your
_________ or _________ . Oxygen then moves
down your _________ and enters the
_________ .The trachea divides into two
branches called _________. These branches
divide into smaller branches called
_________. At the end of the branches are
tiny air sacs called _________. Below your
lungs is a muscle called the _________
INHALING AND EXHALING
Inhaling is when you breathe air (oxygen) in.
Exhaling is when you breathe air (carbon dioxide) out (it exits)
INHALING AND EXHALING
Inhaling
What happens to the lungs?
What happens to the diaphragm?
Exhaling
What happens to the lungs?
What happens to the diaphragm?
Possible Answers
It gets bigger (inflates)
It goes up
It gets smaller (deflates)
It goes down
THE CIRCULATORY SYSTEM
血管系
CIRCULATORY SYSTEM
Look at the picture of the circulatory system.
What do you think the verb “to circulate”
means?
THE CIRCUIT
• The heart pumps oxygenated blood from the lungs
to all the cells in the body
• Once the cells use the oxygen for respiration 呼吸
the blood becomes deoxygenated
• The deoxygenated blood is pumped back to the
lungs to get rid of waste products and to become
oxygenated again.
BLOOD VESSELS
• A blood vessel is a path that blood moves through
• There are three types
• Arteries- carry blood away from the heart
• Veins- carry blood to the heart
• Capillaries- carries blood to and from individual cells. They connect
veins to arteries
WHERE ARE THE BLOOD VESSELS?
6
1
5
2
4
3
THE EXCRETORY SYSTEM
排出器官
EXCRETE
• Excrete means to remove from the body
• Urine= Pee
What does the excretory system do?
idney
K______
The kidney filters blood. It
controls the water balance
and salt balance in your
body.
It removes bad chemicals.
U_____
reters
Urine (pee) moves down the
ureters to the bladder.
ladder
B________
This is where urine is stored
until you are ready to go to
the toilet.
U_____
rethra
Urine leaves the body
through the urethra
Starter
kn
oxygen
h
capillary
v
vein
r
artery
artery
heart
transport
THE NERVOUS SYSTEM
神経系
YOUR SENSORY ORGANS
Eye
Ear
Sight
Hearing
It senses light
It senses sound
Skin
Touch
Nose
Smell
It senses
chemicals
in the air
Tongue
Taste
It senses chemicals in your mouth
It senses
pressure,
temperature
and pain
STIMULI (刺激) AND RESPONSE (反応する)
The stimuli is Light
It is sensed by the eye
The response is close
eyes
STIMULI (刺激) AND RESPONSE (反応する)
STIMULI (刺激) AND RESPONSE (反応する)
STIMULI (刺激) AND RESPONSE (反応する)
NERVOUS SYSTEM
Look at the picture. What do you think the
nervous system is used for?
SENSORY NEURONS
• Send messages from the receptor cells to the brain
• These messages are in the form of electrical impulses
MOTOR NEURONS
• Send messages from the brain to the
muscle cells
• These messages are in the form of
electrical impulses
NERVOUS SYSTEM
• The function of the nervous system is to coordinate (plan) a
response to a stimuli (something we see, hear, smell, taste or
feel)
• It controls how we react to our environment
Stimulus (change) picked up by sense organ
Message carried along nerve cell (Sensory neurone) to spinal
cord
Spinal cord or brain sorts out message
Message carried along nerve cell (motor neurone)
to effector organ
Effector organ brings about a response
REFLEX ACTION
• A reflex action is a response to a stimuli that happens which you cannot
control
• It happens because a message is sent to the motor neuron before the
message goes to the brain
• The message from the sensory neuron takes a shortcut (relay neuron) to the
motor neuron
LABEL THE PARTS
• Relay Neuron
• Leg bone
• Muscle
• Sensory Neuron
• Motor Neuron
• Knee bone
WHICH OF THESE IS A REFLEX
ACTION?