1. The Heart (The Muscular Pump) Presented By: Adrienne Moore

2. The Heart Definition: A muscular pump made up of cardiac muscle fibers. Pumping normally includes 60-100 (BPM). Function: Pumps blood throughout the entire body transporting nutrients, oxygen, and eliminating wastes. Location: Located in the mediastinum more so on the left side of the mediastinum in the chest cavity. Size/Shape: Approximately the size of a fist. The shape compared to an upside-down pear. The tip of the heart at the lower edge is called the apex.

3. The Layers of The Heart The wall of the heart consist of three layers: Endocardium Myocardium Epicardium Pericardium Visceral Pericardium Parietal Pericardium

4. The Three Heart Layers The Endocardium is the inner layer of the heart lining the heart chambers. It Is a very smooth, thin layer that serves to reduce friction as the blood passes through the heart chambers. The Myocardium is the thick muscular middle layer of the heart. When this muscle layer contracts blood is pump through to the blood vessels. The Epicardium is the outer layer of the heart. The Pericardium is the double-layered pleural sac, t he heart is enclosed in. Another name for the epicardium is the Visceral Pericardium, being the inner layer of the sac. The Parietal Pericardium is the outer layer of the sac. The fluid between the two layer is vital because it reduces friction as the heart beat.

8. Heart’s Blood Flow The flow of blood starts at the heart moving to the lungs, back to the heart , and then out to the body tissues and parts. The flow of blood is always done in this order: Deoxygenated blood enters the relaxed right atrium via the superior and inferior vena cava. The right atrium contracts and blood is pumped through the tricuspid valve into the relaxed right ventricle. The right ventricle contracts and blood is pumped through the pulmonary valve into the pulmonary artery, carrying it to the lungs for oxygenation. The left atrium then receives blood returning to the heart after the oxygenation process. This blood goes into the relaxed left atrium from the four pulmonary veins. The left atrium contracts and blood flows through the mitral valve into the relaxed left ventricle. Lastly the left ventricle contracts causing blood to pump through the aortic valve and into the aorta, which carries the blood to all areas of the body.

10. Special tissue within the heart is responsible for conducting an electrical impulse.

11. Stimulates the different chambers to contract in the correct manner.The path that impulses travel as followed:

12. Thank You!