Download Big Picture 1. The lungs bring oxygen into the body when you breath

Big Picture
1. The lungs bring oxygen into the body when you breath.
2. Oxygen has to find its way to every other part of the body, and the blood is
its delivery service.
3. The heart pumps blood to the lungs to pick up oxygen.
4. Then pumps the oxygenated blood out to the rest of the body.
5. After the blood has delivered all the oxygen, it picks up carbon dioxide, a
waste product.
6. Then the blood goes back to the lungs to drop off the carbon dioxide, and
pick up more oxygen.
7. The whole process begins again.
Specifics
Inside of the heart is divided into four chambers: 2 atria and 2 ventricles. The top
of the heart are where the atria are located. The bottom of the heart are where the
atrium are located. Left Atrium, Right Atrium, Left Ventricles, and Right
Ventricles.
• Atria are collection chambers for blood.
• Ventricles receive the blood from the atria and pump it to the lungs and body.
Atrium and Ventricle Specifics:
• The right atrium receives oxygen-poor blood from the body and pumps it to
the right ventricle.
• The right ventricle pumps the oxygen-poor blood to the lungs.
• The left atrium receives oxygen-rich blood from the lungs and pumps it to
the left ventricle.
• The left ventricle pumps the oxygen-rich blood to the body.
Mr. Nole 8th Grade Health
Valves of the heart in order of blood flow:
1. Tricuspid valve – separates the right atrium and right ventricles. It allows
blood flood flow to go one direction and not backwards.
2. Pulmonic valve – allows blood flow to go to the lungs.
3. Mitral valve – separates the left atrium and left ventricle. It allows blood
flow to go one direction.
4. Aortic valve – allows blood flow to the rest of the body.
Artery vs Veins:
• Artery – vessels which carry oxygenated blood from the heart to various
body parts
• Veins – vessels which carry deoxygenated blood from various body parts to
the heart.
Coronary Artery:
Coronary arteries supply blood to the heart muscle. Like all other tissues in the
body, the heart muscle needs oxygen-rich blood to function. Also, oxygen-depleted
blood must be carried away. The coronary arteries wrap around the outside of the
heart. Small branches dive into the heart muscle to bring it blood.
Heart Electrical System
Your heart beat is basically an electric signal which is initiated by the Sinus Node
(the on and off switch). The Sinus Node is considered to be the main switch of the
heart which initiates the electric impulse of the heart and terminates it, also known
as the natural pace maker. When the Sinus Node is turned on (electric switch is on)
an electric current spreads to activate both right atrium and left atrium and then the
AV Node (Atrial Ventrical Node).
The AV Node works like a delay station. When an electric impulse comes to the
AV Node, it is a little bit delayed before the electric impulse goes down to activate
the ventricles. In the ventricles, pathways carry this signal throughout the muscle
so they can contract at the same time to pump blood to the lungs and throughout
the body.
Mr. Nole 8th Grade Health