Download The Circulatory System

The Circulatory System
The Heart: The circulatory pump!
 Heart pumps the blood through the blood vessels
 The heart is made up of 2 pumps (the right and left pumps)
 Each pump has two chambers – an atrium (which receives blood) and a
ventricle (which pumps out blood)
 Blood is directed through the heart through a system of one-way valves
(can’t move backwards)
Arteries: Blood vessels that carry blood away from the heart towards the
capillaries.
Capillaries: Thin walled vessels that branch from the arteries into the spaces
between the body cells. This is where the exchange of materials between the blood
and cells takes place.
Veins: Blood vessels that carry blood towards the heart after receiving it from the
capillaries.
The Circulatory System
1. Superior vena cava returns less oxygenated blood to the heart from the
body.
2. The right atrium receives less oxygenated blood and pumps it to the right
ventricle.
3. The right ventricle pumps it out of the heart and to the lungs via the
pulmonary artery.
4. In the lungs, the blood now releases carbon dioxide (CO2 )and picks up O2 .
5. This oxygenated blood now returns to the heart via the pulmonary vein and
it enters the left atrium.
6. The left atrium then pumps it into the left ventricle.
7. Now this oxygenated blood is pumped out of the thick and powerful left
ventricle and to the rest of the body via the aorta.
B. Questions
1. Name the 4 main chambers of the heart.
Right atrium
Left atrium
Right ventricle
Left ventricle
2. List the 3 different types of blood vessels.
Arteries
Veins
Capillaries
3. Which chambers of the heart carry less oxygenated blood?
Right atrium
Right ventricle
4. The actual exchange of gas in the lungs occurs between the
and the alveoli.
capillaries
5. Less oxygenated blood returning from your leg would enter the heart via the
inferior vena cava
6. This vessel sends freshly oxygenated blood out of the heart to the rest of the
body:
aorta
.