Question

Name the main parts of the circulatory system.

Answer 1

Circulatory system:

1. Circulatory system is a system that involves the transportation of substances through the body with the help of blood.
2. In human body, the amount of blood present is 5.5 L.
3. The significant parts of the circulatory system are - heart, blood vessels, and blood

Main parts of circulatory system:
Heart:

1. The human heart is a muscular, pear-shaped organ that is of the size of a clenched fist and situated slightly towards the left of the chest cavity.
2. The heart is covered by a two-layered membrane known as the pericardium.
3. The heart is a visceral organ that is protected by the rib cage.
4. The heart has four chambers: two auricles and two ventricles.

Blood vessels:

1. Blood vessels in the system of tubes through which blood is carried to various parts of the organs.
2. The blood vessels which take blood away from the heart to various parts of the body are known as arteries.
3. Veins are the blood vessels that bring deoxygenated blood from various organs to the heart.

Blood:

1. Blood is a red color fluid that flows through the blood vessels.
2. It consists of two parts, the plasma, and the cells or corpuscles.
3. Plasma:
   • The liquid parts of the blood consist of 90% water.
   • It is yellowish.
   • Other constituent substances are nutrients, washer products, and hormones.
   • The major functions of plasma are clotting of blood, and transportation of substances such as gases, enzymes, etc.
4. Blood cells:
   1. Red blood cells: These cells are red
   2. White blood cells: They play an important role in immune response toward disease-causing germs.
   3. Platelets: They help with the clotting of blood after an injury.