HOW THE BODY WORKS

 

We breathe air to get oxygen.  

The oxygen goes into the blood in the lungs

 

The blood with oxygen travels from the lungs to the heart

 

The heart is a big pump and it pumps the blood with oxygen to all the parts of the body

 

The oxygen from the blood goes into the cells of the body

 

At the same time, the cells put their waste back into the blood

 

The blood with much less oxygen and the cell’s waste travels back to the heart

 

The heart pumps this blood back to the lungs to get more oxygen

 

The cycle starts over when we take another breath

WHAT ARE THE PARTS OF THE HEART?

 

The heart has a left side and a right side

 

It is divided into four parts, called chambers

 

The atria are on top and the ventricles are on the bottom

 

The left atrium is connected to the left ventricle by the mitral valve

 

The right atrium is connected to the right ventricle by the tricuspid valve

 

The aortic valve pumps blood with oxygen from the left ventricle to the body

    

The pulmonic valve pumps blood from the right ventricle back to the lungs

WHAT IS A HEARTBEAT?

 

The heartbeat sound lub-dub, lub-dub is caused by the heart valves closing.  

 

The first sound, lub, is caused by the tricuspid and mitral valves closing. 

 

The mitral valve and the tricuspid valve control blood flow from the atria to the ventricles  

  

The second sound, dub, is caused by the aortic and pulmonary valves closing.   

 

The aortic and pulmonary valves control blood flow out of the heart.  

HOW DOES THE BLOOD FLOW THROUGH THE HEART?

 

The heart has a right side and a left side

 

Blood enters the heart in the atria

 

The left atria has blood with lots of oxygen- this blood comes from the lungs

 

The blood from the left atria goes through the mitral valve and into the left ventricle

 

The blood from the left ventricle goes though the aortic valve and is pumped to the body

 

The right atria has blood that comes from the body.  It has only a little oxygen in it.   Blood from the right atria goes through the tricuspid valve and into the right ventricle

 

The blood from the right ventricle is pumped through the pulmonic valve back to the lungs to get more oxygen

In order to work right, the heart needs time to fill and enough strength to pump

WHAT MAKES THE HEART PUMP?

 

The heart is controlled by an electrical signal 

 

The signal starts in in SA node - also called the pacemaker of the heart

 

The electrical signal travels to the atria and they contract 

 

Then the electrical signal travels to the ventricles and they contract

 

When the heart is not pumping, it is relaxed and filling with blood

 

We can tell if the heart’s electrical system is working right by looking at an EKG

WHAT IS A PULSE?

 

Your pulse measures the rate your heart is beating. 

The easiest way to test your pulse is to get your heart rate up.  Run around for a few minutes or do jumping jacks. 

 

Stop moving and put two fingers lightly on the side of your neck.  Can you feel your pulse?  Count how many times you feel your pulse in a minute.  

WHAT MAKES THE HEART NOT WORK?

 

The heart can’t fill and pump blood the right way

    

Blood supply to heart is blocked

Electrical system isn’t right

 

  

Sometimes there is a problem with more than one of these at the same time

This site was designed with the
.com
website builder. Create your website today.
Start Now