2. nutrition
• The digestive system,the
respiratory system,the
circulatory system and the
excretory system carry out the
function of nutrition.
3. The digestive system
• The digestive system is made
up of the digestive glands and
the digestive tract.
• The digestive glands: salivary
glands, liver and pancreas.
• The digestive tract: the mouth, the
pharynx, the oesophagus, the
stomach, the small intestine and
the large intestine.
4.
5. The respiratory system
• The respiratory sytem is in charge of
breathing.
• First we inhale air and it goes into to the
lungs.
• Then we exhale air sending it out of the
lungs.
• It is made up of: the nostrils, the
pharynx, the larynx, the trachea, the
bronchi and the lungs.
• The muscle that creates the
movements involved in breathing is
the diaphragm.
6.
7. The excretory system
• The excretory system is made
up of:
• Sweat glands.
• The urinary system.
8. The urinary system
• The urinary system is made up
of: the kidneys, the ureters, the
bladder and the urethra.
9. The circulatory system
• The circulatory system is made
up of: the heart, the blood and
the blood vessels.
• The blood vessels can be:
arteries, veins and capillaries.
10. The blood
• Blood is a red liquid tissue
made up of cells that float in a
red liquid called plasma.
• There are three types of blood
cells:
• Red blood cells
• White blood cells
• Platelets
11. The heart
• The heart is a muscular organ
that pumps blood around the
body.
• Blood enters the atria through
the veins and passes through
the ventricles. Between the
atria and ventricles there are
valves.
13. Human circulation
• Human circulation is closed. In
mammals, the heart septum
separates the two halves of the
heart. This prevents blood with
oxygen from mixing with the
blood carrying carbon dioxide.
• Human circulation is double.
The blood follows two routes.
• Pulmonary circulation.
• Systemic circulation.
