The document summarizes the key functions and components of the digestive, respiratory, excretory, and circulatory systems. The digestive system breaks down food, the respiratory system facilitates gas exchange, the excretory system removes waste, and the circulatory system transports nutrients, oxygen, carbon dioxide, hormones and more throughout the body via the heart, blood and blood vessels. Each system consists of specific organs and pathways that work together to carry out their essential roles in nutrition and maintaining life.

2.  The funtion of nutrition is
esential to life.
 The digestive system,the
respiratory system,the
circulatory system and the
excretory system carry out
the funtion of nutrition.

3.  The digestive system has two
parts : the digestive tract and
the digestive glands.

4.  1-The mouth has salivary glands
that produces saliva,theet that
chew food and a tonge that mixes
chewed food with saliva to form a
ball of food.
 2-The pharynx connects the mouth
and the oesophagus.

5.  3-The oesophagus transports the
food to the stomach.
 4-The stomach is where the food
mixes with gastric juices.
 5-The liver secretes bile.
 6-The pancreas helps in the
digestion of proteins.

6.  7-The small intestine is the longest
part of the digestive tract.Nutrients
pass into the blood through its walls.
 8-The large intestine absorbs water
which passes to the blood.And
finally,undigestive substances are
expelled through the anus.

8. THE DIGESTIVE
SYSTEM
 The funtion of the respiratory system
is breath
 The respiratory system makes two
movements:
Inhale:the air goes into the lungs.
Exhale:the air goes outside the
body

9. PARTS OF THE
RESPIRATORY SYSTEM
 1-The nostrils are two openings in
the nose. They filter the air that we
breathe
 2-The pharynx connects the
larynx,the oesophagus and the
trachea
 3 – the larynx contains the vocal
cords.They produce sound.

10. PARTS OF THE
RESPIRATORY SYSTEM II
 4-The trachea is a tube that takes
air into the bronchi
 5-the bronchi are two branches of
the trachea.They take air to the
lungs.
 6-The lungs are spongy organs
made up of small sacs called
alveoli.

11. PARTS OF THE
RESPIRATORY SYSTEM III
 7-When we breathe,the oxygen in
the air goes to the blood through
the alveoli,and the carbon dioxide
from the blood is released outside
the body.
 8-the diaphragm is the muscle that
creates the movements involved in
breathing.

12. PICTURE OF THE
RESPIRATORY SYSTEM

13.  Theexcretory system filters waste
substances from the blood. It removes
them from the body through excretion.
 The excretory system is made up of :
The urinary system :This is made up
of the kidneys and the urinary tract
Sweat glands : in the skin

14.  1-The kidneys remove waste
substances from the blood and
they make urine.
 2-the ureters take urine from the
kidneys to the bladder.
 3-The bladder stores the urine.
 4-the urethra connects the bladder
to the outside.

16. THE CIRCULATORY
SYSTEM
 The circulatory system transports
nutrients and oxygen to our cells. It
is made up of heart,blood and blood
vessels.
 Heart:is a muscular organ that
pumps blood around the body.
 Blood :collects oxygen from the
alveoli and nutrients and transports
them to all the cells.

17. THE CIRCULATORY
SYSTEM II
 The blood vessels:are the tubes
through which blood circulates.There
are three types of blood vessels:
Arteries:carry blood from the heart
to the rest of the body.
Venis:carry blood from over the
body back to the heart
Capillaries:are very thin vessels
that reach all the cells of the body.

18. PICTURE OF
CIRCULATORY SYSTEM

19.  The blood is a red liquid tissue made up
of cells that float in a liquid called
plasma.
 There are three types of red blood cells:
Red blood cells carry oxygen.
White blood cells remove bacteria
and viruses from the blood.
Plateles are small fragments of cells
that form blood clots.

21.  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.

23.  Human circulation is closed and double.
 Human circulation is closed:in
mammals,the heart septum separetes the
two halves of the heart.
 Human circulation is double:the blood
follows two routes:
 Pulmonary circulation
 Systemic circulation