Transcript The cardiovascular system

The cardiovascular system
aka the “circulatory system”
The two sides of the heart
• When you look at the heart on a piece of
paper, the left and right sides are switched
• This is called anatomical right and left
Right side
Left side
Four main parts of the heart
• Atria = upper chambers (left and right)
• Singular is one atrium
Atria
• Ventricles = lower chambers
(left and right)
Ventricles
Atria
Blood flow through the heart
• Blood enters the atria (top) first
• When the atria contract, the blood is
squeezed into the ventricles
• When the ventricles contract, the blood flows
out of the heart
Blood flow continued
• Blood picks up oxygen in the lungs and then
delivers the oxygen to the body
FYI: Carbon dioxide is also dropped off in the
lungs so it can be exhaled!
Valves
• Valves are flap-like structures that prevent
blood from going backwards
• You can find them between the atria and
ventricles
• They are also between the large arteries and
the ventricles
Valves continued
• The lub-dub sounds of the heart are caused by
the opening and closing of the valves
Valves
Valves
Heart diagram
1. Remember that the right and left sides of the
heart are switched when on paper. Label the
right and left sides of the heart.
2. The atria are the upper chambers of the
heart. The ventricles are the lower
chambers. Label the left and right atria and
right and left ventricles.
Heart diagram continued
3. Oxygen rich blood flows from through a vein
from the lungs into the left atrium. Color the
left atrium and the vein that carries the blood
from the lungs red.
4. Blood flows from the left atrium to the left
ventricle. Color the left ventricle red.
Heart diagram continued
5. Blood flows through an artery from the left
ventricle to the body. The body takes up the
oxygen in the blood. Color this artery red.
6. Blood flows through two large veins from the
body into the right atrium. Color the right
atrium and the two large veins blue.
***Remember that blood is never blue. We are using blue color to represent
blood with little oxygen in it.
Heart diagram continued
7. Blood flows from the right atrium to the right
ventricle. Color the right ventricle blue.
8. Blood flows through an artery from the right
ventricle to the lungs. In the lungs, the blood
picks up oxygen. Color this artery blue
because it doesn’t have oxygen yet.
Heart diagram continued
9. Add arrows to your diagram to show the
blood flow through the heart. Start with the
left atrium.
10. Indicate whether each blood vessel is
carrying blood to or from the lungs or to and
from the body.