The Heart OrganEsther N. Baah-Asante

Organs

Organ is defined as different types of tissues that work as one to perform and accomplish specific functions.

The Human Heart

The Heart• The heart is a muscular pump that is made up of cardiac

muscle fiber that is mainly considered a muscle instead of an organ.

• Heart has four chambers that beat an average of 60 to 100 beat per minute.

• The heart is located in the mediastinum in the chest cavity.• The heart is more on the left side of the chest mediastinum

than the right side.• The heart is about as big as your fist and it lies behind external.• The tip of the heart at the lower edge is the apex.

Layers of the Heart

Layers of the Heart• The heart is composed with three layers called the

endocardium which is the outer layer, myocardium which is the middle layer of the muscular tissue and epicardium which is the inner layer of the heart.

• Is covered by a protective sac called the pericardium which is divided into two layers the visceral and parietal pericardium.

The Heart Chambers

The Heart’s Chambers

• Right and left atria are the upper chambers of the heart.

• Right and left ventricles are the lower chambers of the heart

• They are divided by a wall called intertribal septum and the interventricular septum.

• The atria are called receiving chambers of the heart.• The ventricles are the pumping chambers of the heart.

The Heart Valves

Heart Valves The heart contains four valves called the a

tricuspid valve, pulmonary valve, mitral valve and aortic valve.

tricuspid valve also known as the atrioventricular valve controls the opening between the right atrium and the right ventricle. When blood enters the right ventricle it cannot go into the atrium again.

The prefix tri means its three and cusps means it has three leaflet.

Pulmonary valve is also known as the semilunar valve. Prefix semi means half and lunar means moon which is semilunar means half of the moon which is located between the right ventricle and the pulmonary artery.

The Heart Valves Continue…

The Heart Valves Continued…The mitral valve also known as a bicuspid valve

showing that it has two cusps. The blood flow through the atrioventricular valve then into the left ventricle so it does not return to the left atrium.

Aortic Valve also known as the semilunar valve is located in between the left ventricle and the aorta. When the blood departs from the left ventricle to the aorta , it cannot return back to the left ventricle.

REFERENCESFremgen, Bonnie F., and Suzanne S. Frucht. Medical

Terminology: A Living Language. Upper Saddle River, NJ: Pearson Prentice Hall, 2009. Print.

"Study: Human Heart Cells Regenerate During Lifetime." - Health News. N.p., n.d. Web. 08 Sept. 2014

"Angelina." 2011allsystemsgo -. N.p., n.d. Web. 08 Sept. 2014.

"Aortic Stenosis : Learn About Symptoms and Treatment." MedicineNet. N.p., n.d. Web. 08 Sept. 2014