1. Circulatory System

2. What is the circulatory system?
The circulatory system carries blood and dissolved
substances to and from different places in the body.
The Heart has the job of pumping these things around
the body.
The Heart pumps blood and substances around the
body in tubes called blood vessels.
The Heart and blood vessels together make up the
Circulatory System.

3. Components of our Circulatory System
Blood
Heart
Blood Vessels

4. Functions of our Circulatory System
Main function  transport substances around the body
Transports nutrients absorbed in the intestine to all body cells
Picks up oxygen at lungs and delivers it to all body cells
Carries carbon dioxide from all cells to lungs where it’s released
Transports wastes to the kidneys where they are filtered and excreted
Regulation of body temperature
Transport of disease fighting white blood cells

5. Our circulatory system is a double circulatory system.
This means it has two parts parts.
Lungs
Body cells
the right side of the system
deals with deoxygenated blood.
the left side of the system
deals with oxygenated blood.

6. now lets look inside the heart
This is a vein. It brings blood from the body, except the lungs.
These are arteries. They carry blood away from the heart.
2 atria
Coronary arteries, the hearts own blood supply
2 ventricles
The heart has four chambers
now lets look inside the heart

7. The Heart Artery to Lungs Artery to Head and Body
Vein from Head and Body
Vein from Lungs
Right Atrium
Left Atrium
Left Ventricle
Right Ventricle

8. blood from the heart gets around the body through blood vessels
There are 3 types of blood vessels
a. ARTERY
b VEIN
c CAPILLARY

9. WHY ARE VEINS BLUE AND ARTERIES RED?

10. Arteries carry blood away from the heart.
The ARTERY
Arteries carry blood away from the heart.
the elastic fibres allow the artery to stretch under pressure
thick muscle and elastic fibres
the thick muscle can contract to push the blood along.

11. Veins carry blood towards from the heart.
The VEIN
Veins carry blood towards from the heart.
Veins have valves which act to stop the blood from going in the wrong direction.
thin muscle and elastic fibres
Body muscles surround the veins so that when they contract to move the body, they also squeeze the veins and push the blood along the vessel to the heart.

12. The CAPILLARY Capillaries link Arteries with Veins
Blood vessels that exchange materials between the blood and other body cells.
the wall of a capillary
is only one cell thick
The exchange of materials include gases, nutrients, and wastes

13. What’s in Blood? BLOOD digested food red blood cells white blood cells
oxygen
waste (urea)
platelets
carbon dioxide
hormones
plasma

14. The Blood white blood cells (fight off diseases)
red blood cells (carry oxygen)
Plasma (liquid part)
Platelets (help blood clot)

15. Red Blood Cells Make up almost half blood volume
Biconcave disk shaped; lack a nucleus
Contain haemoglobin, a protein to which oxygen binds, thus enabling red blood cells to transport oxygen.
Oxygen diffuses into red blood cells at the lungs
Oxygen diffuses out of red blood cells at the body cells
Carbon dioxide also binds to haemoglobin

16. White Blood Cells Make up less than 1% of blood volume
Larger than red blood cells; only blood cells that contain a nucleus
Our body’s army; they are infection fighting cells, destroying bacteria and viruses

17. Platelets Make up less than 1% of blood volume
Tiny pieces/fragments of cells
Involved in clotting blood

18. Plasma Makes up over half of blood volume
A yellowish protein rich liquid that moves the other three blood components around our body.
Maintains osmotic fluid balance in body

19. What blood type are you? BLOOD TYPES
There are 4 different blood types:
1) AB
2) A
3) B
4) O
What blood type are you?

20. Human Heart Average Size: about the size of your fist.
Location: Centre of the chest, slightly to the left
Structure: Made up of cardiac muscle tissue, nerve tissue, and connective tissue.
Function: contracts and relaxes to pump blood throughout the body.

21. Heart Facts
Beats over 3 Billion times during a lifetime
The ribcage protects the heart
The heart can continue to beat even when removed from the body.
Physical activity, stress, temperature, general health and drugs affect our heat rate.
Video

22. SUMMARY
Arteries take blood ______ from the heart. The walls of an artery are made up of thick _________ walls and elastic fibres. Veins carry blood ________ the heart and also have valves. The _________ link arteries and veins, and have a one cell thick wall. Blood is made up of four main things ______, the liquid part of the blood; Red Blood Cells to carry ______; White Blood cells to protect the body from disease and _________ to help blood clot.
away
muscular
towards
capillaries
plasma
oxygen
platelets