The Heart
By: Brenda, Jackie, and Gabi

The heart is the muscle that is responsible for pumping blood to your whole body. It is located in the thoracic cavity just above the diaphragm, and it is about the size of your fist. The heart is part of the circulatory system which also includes the arteries, veins, and capillaries.


Passage of blood through the heart
1. Enter through the vena cava
2. Right Atrium
3.Tricuspid Valve
4. Right Ventricle
5. Pulmonary Valve
6. Pulmonary Arteries to the lungs
7. Exhale Carbon Dioxide
8. Inhale Oxygen
9.Pulmonary Veins
10.Left Atrium
11.Mitral Valve
12. Left Ventricle
13. Aortic Valve
14. Aorta to rest of body

Layers of the heart
*Pericardium- layer outside of the heart
*Myocardium- middle muscle layer
*Endocardium- smooth inner lining

Atria and Ventricles
*Right Atrium- receives unoxygenated blood from body
*Right Ventricle- recieves blood from right atrium and pumps it to lungs
*Left Atrium- recieves oxygenated blood from lungs
*Left Ventricle- recieves blood from left atrium and pumps it to body

Heart Beat *Systole- Contracting/Squeezing of the heart
*Diastole- Resting period
(Blood Pressure is systolic/diastolic)

Sinus Rhythmheart_rhythm.jpg
*P- Electrical impulse passed through left and right atrial muscles
*QRS- Ventricular contraction
*T - Electrical changes in the ventricles as they relax

Different Sinus Rhythms heart_rhythms.JPG

Heart Attack! heart_attack.jpeg

Fun Facts
1. The first succesful open heart surgery was done by Dr. Daniel Hale Williams in 1954.
2. A long time ago people believed that emotions came from the heart.
3. In the average lifetime, the heart beats 2.5 billion times.
4. The human heart is fully developed about eight weeks after conception.
5. Diseases relating to the heart are the leading cause of death in the United States.
6. More heart attacks occur between 8 and 9 am.

The heart is a very important muscle that we need to live, and it is always working by supplying blood to our body. It is very important to make healthy decisions in order to have a healthy heart.

Q: What are some diseases related to the heart?
Q: What is a heart attack?
Q: What can you do to keep your heart healthy?
Q: Is a pulse taken at an arterie or vein?

*Sources* -Pictures-
Normal Heart
Moving Heart
Sinus Rhythm
Diseased Heart
Different Sinus Rhythms

S Staudt, Health Science Lecture, MacArthur High School, 1st semester 07-08

*Related Links*
Really Cool Heart Website

Anatomy of the Heart