WELCOME

by

N.ANBAZHAGAN,SECONDIGRADE TEACHER,

PANCHAYAT UNION MIDDLE SCHOOL,

VISOOR,UTHIRAMERUR UNION,

KANCHEEPURAM DISTRICT,

TAMIL NADU.

Standard : 8 Science

OBJECTIVESABOUT THE HEARTSPECIMEN OF THE HEARTHEART CHAMPERSLOCATION OF THE HEARTPARTS OF THE HEARTHEART FUNCTIONINGBLOOD CIRCULATIONTHE LIVING PUMPHEART BEATSPREVENTION OF HEART DISEASELAYERS OF THE HEARTMore detailsEvaluation

The human heart is a conical muscular organ situated in the middle mediastinum in between the two lungs.The base of the heart lies upwards while the apex lies downwards and titled towards the left.The heart is covered by a double walled membranous sac known as the PERICARDIUM.PERICARDIUM.Pericardial fluid, present inside the membrane, protects the heart from shock and lubricates its movements.Heart is very important organ of human body.Heart is very important organ of human body.It is made of muscle and has four chambers, Two in each It is made of muscle and has four chambers, Two in each

side.side.Upper chambers are atriums.Upper chambers are atriums.Lower chambers are ventricles.Lower chambers are ventricles.

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SPECIMEN OF THE HEARTSPECIMEN OF THE HEART

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HEART CHAMPERS

Right atriumRight atrium

Left atriumLeft atrium

Left ventricleLeft ventricle

Right ventricleRight ventricle

UPPER CHAMBERSLeft atria.

Right atria.It has

smaller and less

muscular.

LOWER CHAMBERS

Left ventricle.Right

ventricle.It has larger and more muscular.

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LOCATION OF THE HEART

LOCATION OF THE HEART

The human heart is a conical muscular organ situated in the middle mediastinum in between the two lungs.

HEART PUMPS BLOOD TO

WHOLE BODY

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PARTS OFthe HEART

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THE WORK OF THE HEARTCirculating blood.

The steady pumping of the heart supports life by moving blood through the body. As it flows, blood delivers food and oxygen to all the body's cells and carries away wastes. Blood returns to the heart carrying a waste gas called carbon dioxide that cells produce as they use oxygen to obtain energy from food.

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BLOOD CIRCULATION

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THE LIVING PUMP

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HEART BEATS

Cardiac output = stroke volume x heart rate (number of ventricular

contractions/min)= 70 ml/stroke x 72 strokes/min= 5040 ml/min (5.04 litres/min)

Regulating the heart rate. The heart's cycle of activity has two stages, systole and diastole. Systole (pronounced SIHS tuh lee) occurs when the ventricles contract. Diastole (pronounced dy AS tuh lee) is the stage when the ventricles relax and the atria contract. One complete cycle of contraction and relaxation--called a cardiac cycle--makes up one heartbeat.

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Avoid Alcohol.

Reduce Over Weight.

Regular Exercise.

Less Tensions And Emotions

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LAYERS OF THE HEART

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EVALUATION

1.Write the parts of the heart?

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2.Draw the structure of the heart?

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More details

Heart diagram Specimen of the heartValvesCoronary

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Mitral valve

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Beaf heart

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Coronary circulation

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Surface heart coronary

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