Question

write a short note on function of heart

Answer 1

heart is an muscular organs which pumps blood around the whole parts and body tissues through a vasculature which is made up of 4 chambers and valves with a septum the 2 AV valves and 2 semilunar valves . 
  - oxygenated blood leaves lungs then it reaches to LV of the heart through pulmonary veins , 
  - LA squeezes the oxygenated blood to lungs then it pumped by LV to the all tissues of the body .
  - aorta branches to form arteries that carry to various tissues and it is terminated in capillaries 
   - capillaries helps to exchange oxygen and carbondioxide and join to form veins .
  - veins from tissues forms superior and inferior vena cava .
  - the vena cava pour blood into RA . 
  - RA squeezes blood into RV . 
   - then lungs capillaries helps to exchange carbondioxide with oxygen . 

Answer 2

Heart is located in the thoracic cavity , in between the two lungs slightly tilted to the left.

It is derived from mesoderm and has the size of clenched fist,

Heart is protected by a double walled membranous bag called pericardium.

Pericardium consists of 2 layers ,outer parietal pericardium and an inner visceral pericardium attached to the heart.A space called pericardial cavity is present between two layers which is filled with fluid called pericardial fluid .

Pericardium protects the heart from shocks and mechanical injuries.

Our heart is divided into 4 chambers two relatively small chambers called atrium and two larger lower chambers called ventricles

The right and left atrium is separated by THIN muscular Interatrial  septum