Question

write a short note about◆ HEART◆


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Answer 1

$\huge\red{Heart}$

➡️It is a conical muscular structure that brings about circulation in the body

➡️The broader base is upward and the narrow pointed appex is downward

➡️It lies in the thoracic cavity between the two lungs

➡️Reddish brown in color

➡️Size:-

✒️12 cm in length and 9 cm in breadth

➡️ Weight:-

✒️300 g in case of males and 250 g in case of females

➡️Lined by a narrow fluid filled sack , called pericardium

➡️It helps in frictionless expansion and contraction of heart

$\orange{Internal \: Structure \: Of \: Heart}$

➡️It is completely divided into left and right side by a longitudinal partition wall called the septum

➡️It prevents the mixing of oxygenated and deoxygenated blood

$\pink{Chambers \: Of \: Heart}$

➡️There are four Chambers of the heart

➡️The upper chamber of the heart are small and have thin walled called $\bold{atrium}$

➡️The lower Chambers are large and thick walled called $\bold{ventricles}$

$\purple{Wall \: Of \: Heart}$

➡️The wall of heart is thin in $\bold{auricle}$ , thick in \bold{ventricle}ventricle , and thickest in the $\bold{left \: ventricle}$

➡️This is because the $\bold{ventricles}$ have to push the blood throughout the body

➡️So, it has to apply the maximum pressure

➡️In order to withstand the pressure, the wall becomes thick

$\blue{Blood \: Vessels \: Of \: The \: Heart}$

$\bold{1) Right \: Atrium}$

$\bold{2) Superior \:Vena \:cava}$

$\bold{3) Inferior \: Vena\:cava}$

Left atrium → Pulmonary vein

Right Ventricle → Pulmonary Artery

Left Ventricle → Aorta

$\green{Valves \: Of \: The \: Heart}$

➡️The opening between right atrium and right ventricle is guarded by $\bold{tricuspid \:valve}$

➡️The opening between left Atrium and left ventricle is guarded by $\bold{Bicuspid \:Valve}$

➡️The right Ventricle opens into Pulmonary Artery and this opening is guarded by $\bold{Semilunar \:Pulmonary \: valve}$

➡️The left ventricle opens into $\bold{Aorta}$ , and this opening is guarded by $\bold{Semilunar\: Aortic\: Pump}$

Answer 2

Answer:

heart is a muscular structure that bring about circulation in body .....

it lies in cavity between two lines....

reddish brown in colour....

and its size is 12 cm in length and 9 cm in breadth.....