The document discusses the structure and function of the human heart. It describes the heart as a muscular organ that pumps blood through the body via repeated contractions. The heart contains four chambers - left and right atria which receive blood, and left and right ventricles which pump blood out. It circulates blood through two circuits - the pulmonary circulation which pumps to the lungs, and the systemic circulation which pumps to the rest of the body. The cardiac cycle involves atrial and ventricular systole to pump blood through the heart and body.

2. Contents
• Introduction
• Chambers of heart
• Circulation in heart
• Cardiac cycle
• Blood pressure

3. Dated: 2th Feb,12
Human Heart

4. ■Introduction:
Heart is a muscular organ responsible for pumping
blood through blood vessels by repeated contraction.
■Cardiac Muscles:
The bulk of the walls of heart chambers is made of
“Cardiac Muscles”.
■Location:
Heart is situated between lungs , in the thorax cavity
under breast bone.

6. Pericardial fluid
It is a fluid present between pericardium (sac in which heart is
enclosed) and heart walls.

7. Chambers of heart
▪ Right Atria
▪ Left Atria
▪ Right Ventricle
▪Left Ventricle

8. Circulation in Heart
Human heart works as a double pump. It receives
De-oxygenated blood from blood and pumps it to lungs.
Mean-while it receives oxygenated blood from lungs and pumps it
to all body.

9. Right
atrium
• Receives deoxygenated blood from body.
Right
ventricle
• Transmit deoxygenated blood to pulmonary trunk.
• Tricuspid valve is present is here.
Pulmonar
y trunk
• It pumps deoxygenated blood to lungs.
Left
atrium
• Receives oxygenated blood.
• Bicuspid valve is preset here.
Left
ventricle
• Pumps oxygenated blood to aorta.
• Pumps oxygenated blood to all parts of the body.
Aorta

11. DOUBLE CIRCUIT CIRCULATON OF BLOOD

12. Pulmonary and
systematic circulation
•Body system
•Lungs
Right
atrium
Left atrium
Left
ventricle
Right
ventricle
Systemic
circulation
Pulmonary
circulation

13. CARDIAC CYCLE
Cardiac cycle consists of following steps.
Atrial systole
Ventricular systole

14. Heart rate is the numbers
of times the heart beat per
minute.
Pulse is the rhythmic
expansion & contraction of
an artery.

15. Blood Pressure