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 2ND 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
1. Visceral layer of serous pericardium
2. Comprised of mesothelial cells and fat and connective tissues
 Myocardium
1. Muscle layer
2. Comprised of cardiomyocytes
 Endocardium
1. Lines inner surface of heart chambers and valves.
2. Comprised of a layer of endothelial cells, and a layer of
subendocardial connective tissue.
 Pericardium
1. 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!