The Heart - Structure

1
The Heart - Structure
Aorta
Pulmonary artery
Vena cavae
Pulmonary veins
Left atrium
Right atrium
Bicuspid valve
Left ventricle
Right ventricle
Cardiac muscle
2
How Blood is Pumped around the Body
Lungs

• Blood flows around the body in a figure of
  eight circuit, passing through the heart twice
  on each circuit.

(A)
(A)

• Blood travels away from the heart through
  arteries (A).

(V)
(V)

• Blood returns to the heart through veins (V).

Heart
There are 2 separate loops to the circuit

• The top loop carries blood from the heart to
  the lungs and back.

Body

• The bottom loop carries blood from the heart to
  all over the body and back.

3
How the Heart Pumps Blood
The heart is divided into 2 parts. Each part is
a pump, so the heart is a double pump.
To the lungs
Tothe body
From the body
From the lungs
The right side pumps deoxygenated blood to the
lungs to pick up oxygen.
The left side pumps oxygenated blood to the rest
of the body for use.
4
The Cardiac Cycle - How the Heart Beats
5
Blood Flow around the Body Top Loop
1. Blood leaves the right side of the heart via
the pulmonary artery and goes to the lungs where
it is oxygenated.
Lungs
Pulmonary artery
Pulmonary vein
2. It then travels back to the left side of the
heart via the pulmonary vein.
Heart
Body
6
Blood Flow around the Body - Bottom Loop
3. The left side of the heart then pumps the
oxygenated blood around the rest of the body
for use, via the aorta.
Lungs
Vena Cava
Aorta
4. Once the oxygen has been used, the blood
becomes deoxygenated and returns to the right
side of the heart via the vena cava.
Heart
Body