Structure and function of heart

THIS SLIDE SPECIALLY DEALS WITH THE HEART'S STRUCTURE AND IT'S FUNCTION.

1. STRUCTURE AND FUNCTION OF HEART. Submitted by: Prajakta Panda Regd. No. 190704180001 B.Sc biochemistry 2 nd Year Physiology: life sustaining system

2. Location of heart The heart is located in the thoracic cavity. It is tilted towards the left side of the lungs. The tip of the heart is called ‘Apex‘. Weight of the heart is said to be about 300 gms in males and 250 gms in females.

3. Structure of heart. The human heart is a four-chambered muscular organ, shaped and sized roughly like a man’s closed fist. It is divided into four chambers i.e. Two atrium and two ventricles. The heart is partitioned by Septum into left side and right side.

4. Layers of heart. Epicardium Visceral layer of serous pericardium Comprised of mesothelial cells and fat and connective tissues Myocardium Muscle layer Comprised of cardiomyocytes Endocardium Lines inner surface of heart chambers and valves. Comprised of a layer of endothelial cells, and a layer of subendocardial connective tissue. Pericardium Protective covering.

5. Functions of heart. Pumping oxygenated blood to the other body parts.
Pumping hormones and other vital substances to different parts of the body.
Receiving deoxygenated blood and carrying metabolic waste products from the body and pumping it to the lungs for oxygenation.
Maintaining blood pressure.

6. Cardiac cycle The cardiac cycle is the performance of the human heart from the ending of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, which is called as systole. It lasts about 0.8 secs.

7. Thank you!