All the living organisms whether they are unicellular or multi-cellular need a transport system to carry useful substances to different parts of the body and to carry waste and harmful substances to the organs from where they can be disposed.

The differences between artery and vein are as follows:

Artery

Vein

They carry oxygenated blood.

They carry deoxygenated blood.

There is no valve in arteries.

There is a valve in veins.

Arteries are elastic in nature.

Veins are inelastic in nature.

They are deep-seated in muscles.

They are superficial in muscle.

The size of the human heart is about 12 cm in length and 9 cm in breadth.

The average weight of the human heart is about 300 grams in adults.

Capillaries are defined as the minute blood vessels which form a network. Arteries end in capillaries and veins start from the capillaries.

The average weight of the human heart is about 300 grams in adults.
The size of the human heart is about 12 cm in length and 9 cm in breadth.
All the living organisms whether they are unicellular or multi-cellular need a transport system to carry useful substances to different parts of the body and to carry waste and harmful substances to the organs from where they can be disposed.

The heart has four chambers. They are:

  1. Left ventricle
  2. Right ventricle
  3. Right auricle
  4. Left auricle

The vessels which carry blood to the heart are called veins. Veins carry deoxygenated blood to the heart. They have thethinner wall than that of arteries and have valves. Capillaries collect blood from tissues and carry to the heart.

The heart is an important organ in our body. It is made up of cardiac muscles. The heart pumps blood from the heart to the different part of the body. The heart supplies oxygenated blood to the cells through blood vessels. The heart also helps to collect deoxygenated blood from different cells, send it to lungs for purification and then transport again to the cells.

The heart has four chambers, they are:

  1. Left ventricle
  2. Right ventricle
  3. Right auricle
  4. Left auricle

There are two upper chambers and two lower chambers. The heart is internally divided into the right chamber and left chamber by a thick muscular wall called septum.