2. NUTRITIONThe function of nutrition is essential to live .
Nutrients give our cells all the energy theyneed. The digestive
system , the respiratorysystem , the circulatory system and
theexcretory system carry out the function ofnutrition. 3. THE
DIGESTIVE SYSTEMThe digestivesystem is madeup of the digestivetract
and digestiveglands. 4. THE RESPIRATORY SYSTEMThe respiratory
system is in charche ofbreathing .Breathing makes two movements :
First , we inhale air and it goes into to thelungs . Then , we
exhale air sending it out of thelungs . 5. THE EXCRETORY SYSTEMThe
excretory system filters wastesubstances from the blood .The
excretory system is made up of : Sweat glands The urinary system :
Is made up of thekidneys and the urinary tract . 6. THE EXCRETORY
SYSTEM1. The kidneys remove waste substancesfrom the blood and they
make urine .2. The ureters take urine from the kidneysto the
bladder .3. The bladder stores the urine .4. The urethra connects
the bladder to theoutside . 7. THE CIRCULATORY SYSTEMThe
circulatory system transports nutrientsand oxygen to our cells . It
is made up ofthe heart , blood , and blood vessels .The heart is a
muscular organ that pumpsblood around the body .The blood collects
oxygen and nutrientsand transports them to all the cells . It
alsocollects waste substances and takes themto the sweat glands and
the urinarysystem . 8. The blood vessels : there are 3 types of
bloodvessels : arteries , veins and capillaries . 9. Capillaries:
are very thin vessels that reachall the cells of the body.Arteries:
carry blood from the heart to therest of the body .Veins: carry
blood from all over the bodyback to the heart . 10. THE BLOODBlood
is a red tissue made up of cells thatfloat in a liquid called
plasma .There are three types of blood cells , redblood cells ,
white blood cells and platelets . Red blood cells carry oxygen .
White blood cells remove bacteria andviruses from the blood .
Platelets are small fragments of cells thatforms blood clots . 11.
12 12. THE HEARTThe heart uses rhythmic systole anddiastole
movements to pump the bloodaround the body .Blood enters the atria
through the veins andpasses to the ventricles .Blood comes out of
the ventricles , throughthe arteries and travels all over the body
. 13. Heart septum 14. HUMAN CIRCULATIONHuman circulation is closed
and double .Human circulation is closed . In mamals ,the heart
septum separates the two halvesof the heart .Human circulation is
double . The bloodfollows two routes . Pulmonary circulation .
Systemic circulation .
