1. NUTRITION
BY
ALEX VILA
unit 3, NUTRITION BY ALEX VILA

2. NUTRITION
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 has two parts: digestive glands and digestive tract.
unit 3, NUTRITION BY ALEX VILA

3. RESPIRATORY SYSTEM
The respiratory system is in charge of breathing.
Breathing makes two movements:
· First, we inhale air and it goes into the lungs.
· Then, we exhale air sending it out of the lungs.
unit 3, NUTRITION BY ALEX VILA

4. CIRCULATORY SYSTEM
The circulatory system transports nutrients and oxygen to our cells. It is made up of the heart,
blood, and blood vessels.
The heart is a muscular organ that pumps blood around the body.
The blood collects oxygen and nutrients and transports them to all the cells. It also collects
waste substances and takes them to the the sweat glands and the urinary system.
There are three types of blood vessels: arteries, veins and capillaries.
unit 3, NUTRITION BY ALEX VILA

5. BLOOD
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 platelets.
 Red; blood cells carry oxygen.
 White; blood cells remove bacteria and viruses from the blood.
 Platelets; are small fragments of cells that form blood clots.
unit 3, NUTRITION BY ALEX VILA

6. THE HEART
The heart uses rhythmic systole and diastole movements to pump the blood around the
body.
First blood enters the atria through the veins and passes to the ventricles.
Then blood comes out of the ventricles, through the arteries and travels all over the body.
unit 3, NUTRITION BY ALEX VILA

7. HUMAN CIRCULATION
Human circulation is closed and double.
 Human circulationis closed. In mammals , the heart septum separates the two halvesof the
heart
 Human circulation is double. The blood has two routes:
- Pulmonary circulation
- Systemic circulation
unit 3, NUTRITION BY ALEX VILA

8. THE END
THAT´S ALL FOLKS
hAPPY FRIDAYS
unit 3, NUTRITION BY ALEX VILA