Human Heart

We see and listen about heart everywhere. A long time ago, people even thought that their emotions came from their heart, perhaps because the heart beats quicker when a person is terrified or energized. Let’s see what does it look like. What is its function. And lots more.

COLOUR:-PINKISH SIZE :- SIZE OF A FIST WEIGHT :- MALES-300 grams. FEMALES-225 grams SHAPE-CONE SHAPED

COVERING:-HEART IS PROTECTED BY A DOUBBLE WALLED MEMBRANOUS COVERING CALLED PERICARDIUM.IT CONTAINS LUBRICATING PERICARDIUM FLUID WHICH REDUCES FRICTION DURING HEART BEAT AND PROTECTS IT FROM MECHANICAL INJURIES.

LOCATION:-NOT ON THE LEFT SIDE, BUT IT IS CENTRALLY SITUATED,ABOVE THE DIAPHRAGM IN THE RIBCAGE.NARROW END OF THE ROUGHLY TRIANGULAR HEART IS POINTED TO THE LEFT SIDE {SEE FIGURE} AND DURING WORKING CONTRACTION OF HEART IS MOST POWERFULL AT THIS END GIVING A FEELING OF HEART BEAT ON LEFT SIDE.

CHAMBERS IN HEART AURICLES {MARKED 4 & 9} ARE TOW UPPER CHAMBERS. VENTRICLES ARE TWO LOWER CHAMBERS. AURICLES :-THEY HAVE THINNER WALLS BECAUSE THEIR MAJOR FUNCTION IS TO RECEIVE BLOOD FROM BODY. VENTRICLES :-THEY HAVE THICK MUSCULAR WALL BECAUSE THEY HAVE TO PUMP BLOOD TO LONG DISTANCE

BLOOD VESSELS ENTERING HEART ANTERIOR VANA CAVA {MARKED AS 6} BRING DEOXYGINATED BLOOD TO RIGHT AURICLE FROM UPPER BODY PARTS. POSTERIOR VANA CAVA- {MARKED AS 1} CAVA-BRING DEOXYGINATED BLOOD TO RIGHT AURICLE FROM LOWER BODY PARTS BESIDE THIS 4 PULMONARY VEINS ARE RECEIVED BY LEFT AURICLE.THEY BRING OXYGINATED BLOOD.

BLOOD VESSELS LEAVING HEART PULMONARY ARTERY {MARKED AS 5} –IT CARRIES DEOXYGINATED BLOOD TO LUNGS FOR OXYGINATION FROM RIGHT VENTRICLE. AORTA –CARRIES OXYGINATED BLOOD TO BODY PARTS FROM LEFT VENTRICLE.

CORONARY ARTERIES {MARKED AS 3} ARISE AT BASE OF AORTA.THEY SUPPLY BLOOD TO HEART MUSLES .THEIR BLOCKAGE LEAD TO MYOCARDIAL INFRACTION OR HEART ATTACK.

VALVES IN THE HEART RIGHT ATRIO-VENTRICULAR VALVE LEFT ATRIO-VENTRICULARVALVE PULMONARY SEMILUNAR VALVE AORTIC SEMILUNAR VALVE

PACEMAKER TISSUES OF THE HEART SINO ATRIAL NODE ATRIO VENTRICULAR NODE BUNDLE OF HISS PURKINJE FIBRES

OXYGINATION IMPURE BLOOD IS BROUGHT BY ANTERIOR AND POSTERIOR VANACAVAS

THROUGH RIGHT RIGHT AURICLETRICUSPID VALVE VENTRICLE

THROUGH

LUNGS

PULMONARY ARTERY

THROUGH PULMONARY VEIN

TO WHOLE BODY

AORTA

THROUGH A.V. NODE

LEFT VENTRICLE

THROUGH BICUSPID VALVE

LEFT AURICLE

RHYTHMIC CONTRACTION AND RELACTION OF HEART IS KNOWN AR HEART BEAT HUMAN HEART BEATS WITH “LUBB DUBB” SOUND FIRST IT BEATS WITH “LUBB” LOW PITCH SOUND AND THEN WITH “DUBB” WHICH IS HIGH PITCH SOUND.ADULT HUMAN’S HEART BEATS 64 -72 TIMES IN A MINUTE.

SLIDE SHOW BY ABHAS TANDON THANKS TO RITWIK AAKASH ANCHIT SAIF ASAD