. Nutrients give our cells all the
energy they need .
. The digestive system , the
respiratory system , the circulatory
system and the excretory system
carry out the function of nutrition
THE DIGESTIVE SYSTEM
It has two parts digestive tract and digestive glands
The respiratory system is in charge of
Breathing has two movements
First , we inhale air and it goes into
the lungs .
Then , we exhale air sending it out of
Nostrils , pharynx , larynx , trachea , bronchi , lungs , diaphragm ,
The excretory system filters waste
substances from the blood . It removes
them from the body through excretion .
The exretory system is made up of .
Sweat glands in the skin
The urinary system . This is made up of the
kidneys and the urinary tract .
The circulatory system transport
nutrients and oxygen to our cells . It is
made up of the heart the blood and
blood vessels .
The blood collect oxygen and nutrients
and transport them to all the cells . It also
collect waste substances and takes them
to the sweat glands and the urinary
Blood is a red liquid tissue made up of
cells that float in a liquid called plasma
There are three types of blood cells red
blood cells , white blood cells and
Red blood cells carry oxygen .
White blood cells remove bacteria and
viruses from the blood .
Platelets are small fragments of cell that
form blood clots .
The heart uses rhythmic systole and
diastole movements to pump the
blood around the body .
Blood enters the atria through the
veins and passes to the ventricles .
Blood comes out of the ventricles
through the arteries and travels all
over the body