Heart

The Human Body Pump!

BASICALLY…The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system…

ascular system.

Reality!!!expectation

STRUCTURE & LOCATION

The apex (pointed end) points down and to the left. It is 5 inches (12 cm) long, 3.5 inches (8-9 cm) wide and 2.5 inches (6 cm) from front to back, and is roughly the size of your fist.

The average weight of a female human heart is 9 ounces and a male's heart is 10.5 ounces.

The heart comprises less than 0.5 percent of the total body weight.

The heart has 3 layers:

Endocardium; smooth inner lining.

Myocardium; middle layer of the muscle.

Pericardium; fluid sac call surrounding it.

The

heart is

divided

into 4 chambers;

2) The right ventricle receives blood from the right atrium and pumps it to the lungs

where it is loaded with oxygen.

3) The left atrium receives blood from the lungs and pumps it to

the left ventricle.

4) The left ventricle pumps

oxygen rich blood to the rest of the body, the

vigorous contractions create blood

pressure

5) The blood is collected from the body and

sent back to the heart!

1) The right atrium pumps

the blood to the right ventricle from the veins.

CHAMBERSAND

CIRCULATION

Each chamber has

a valve preventing backflow of

blood.

Tricuspid valve (exit

of right atrium)

Pulmonary Valve (exit

of right ventricle)

Mitral Valve (exit

of left atrium)

Aortic Valve (exit

of left ventricle)

1) When each chamber contracts, valve at its exit opens!

2) When it is finished contracting, the valve closes preventing backflow of blood

3) When the heart muscle contracts, blood is pumped out of the heart.

4) Heart contracts in 2 stages;1) Both atria contract at same

time pumping blood to ventricle.

2) The ventricles contract together to propel blood out of heart, so the muscle relaxes before the next beat and refills

RIGHT LUNG

LEFT LUNG

RIGHT ATRIUM

PULMONARY ARTERIES

RIGHT VENTRICLE

LEFT

VENTRICLE

ARTERY TO HEAD AND ARMS

AO

RTA

INFE

RIO

R V

EN

A C

AVA

SU

PER

IOR

V

EN

A C

AVA

PULMONARY ARTERY; CARRY DEOXYGENATED BLOOD FROM HEART TO THE LUNGS.

BEGINS AT THE BASE OF THE RIGHT VENTRICLE.

BRANCHES INTO RIGHT AND LEFT ARTERY WHICH DELIVER BLOOD TO THE CORRESPONDING LUNG.

THE AORTA IS THE LARGEST ARTERY IN THE HUMAN BODY, IT ORIGIATES FROM THE LEFT VENTRICLE AND EXTENDS DOWN TO TE ABDOMEN.

HERE IT BIFURCATES INTO SMALLER “ILLIAC” ARTERIES.

AORTA

THE SUPERIOR VENA CAVA IS LARGE IN DIAMETER YET A SHORTER VEIN THAT CARRIES DEOXYGENATED BLOOD FROM THE UPPER HALF OF THE BODY TO THE RIGHT ATRIUM OF THE HEART

SUPERIOR VENA CAVA

INFERIOR VENA CAVA

ALSO KNOWN AS THE POSTERIOR VENA CAVA.

LARGE VEIN

CARRIES DE OXYGENATED BLOOD FROM LOWER HALF OF THE BODY TO THE RIGHT ATRIUM

THANK YOU

MADE BY AAKLIT TANEJA..

.

(WITH GREAT EFFORTS )