The circulatory system is responsible for transporting materials such as oxygen, carbon dioxide, nutrients, hormones, and waste throughout the body using a double circulation mechanism. The heart consists of four chambers: the left side handles oxygenated blood from the lungs to the body, while the right side manages deoxygenated blood returning from the body to the lungs. Valves within the heart prevent backflow and ensure proper blood flow through the atria and ventricles.

1. Circulatory
Circulatory
System
System
Circulation
Circulation
Heart structure
Heart structure

2. Function:
To transport materials
around the body
Oxygen
Carbon dioxide
Digested food
Hormones
Waste chemicals - urea
Heat

3. Double Circulation
Double Circulation
Left side
Oxygenated
blood from the
lungs enters
the heart and
is pumped to
the body
organs and
tissues
Right side
Deoxygenated
blood from the
body is
returned to
the heart to
be pumped to
the lungs

4. Systemic – to
the organs of
the body
Pulmonary
system – up to
the lungs
OXYGEN
CARBON
DIOXIDE

5. Structure of the heart
Structure of the heart

6. You need to be
able to label all
parts of the heart

7. LEFT SIDE
RIGHT SIDE
Left ventricle – has
a thicker muscle
wall than right side
– why?
Right ventricle
valve
right atrium
?
Blood from lungs
Blood
from ?

8. Body
organs

9. LEFT SIDE
RIGHT SIDE
Left ventricle
Right ventricle
valve
right atrium Left atrium
Blood from lungs
Blood
from ?
Blood to the ?
Blood to the ?

11. Beating heart –
Beating heart – blood flow
blood flow
The valves prevent
the backflow of
blood.

13. How do the
valves work?
How many
can you see?

14. Atrium and ventricle
muscles force the blood
through and out of the
heart
out
in in
Can you
see the 4
valves?

15. VALVE
between the
atrium and
ventricle
Ventricle wall
Ventricle
chamber

16. The end
The end