Heart and Blood vessels

What is Heart?

Human Heart

The heart is a muscular organ present in both animals and humans involved in pumping blood through blood vessels. Blood Vessels are the tubular structure that comprises of tissues, organs, vein, artery or capillary associated with transporting blood to the entire body. It carries blood both to and from the heart. All vital nutrients and oxygen required by the organs are found in the blood. One of the other vital function of the blood vessels is that they eradicate the unwanted waste products and carbon dioxide from the body. Most of the waste products are disposed of by the excretory system.

Human heartSo what is it that the heart and blood vessels do?

As we already know, the heart pumps blood through the body. As mentioned earlier blood aids in eradicating waste products in our body and it also helps in transportation of nutrients. The essential nutrient such as oxygen is found in blood.
The deoxygenated blood is received by the right side of the heart. This blood is pumped to the lungs once it passes through the right ventricle and right atrium. Here, blood picks up oxygen hence carbon dioxide is removed. Once the blood passes through the lungs it then flows back into the left atrium and then passes through the left ventricle. Again it is pumped back to the artery. Now all nutrients and oxygen pass through organs, tissues, and other body cells.

The most important function of blood vessels is to carry blood around the body and they also help in controlling the body’s blood pressure.

Types of Blood Vessels


There are mainly five types of blood vessels:
Arteries: It carries oxygenated blood pumped from the heart to varies parts of the body.
Arterioles: They are the smallest version of arteries.They help in delivering the blood to capillaries. They are made up of muscular walls. The diameter of arterioles decreases in its size when subjected to air pollution and also due to age factor.
Capillaries: They are the smallest blood vessels. They connect venules and arterioles.
Venules: They are the group of capillaries. The blood from capillaries is collected by venules and are drained into the veins.
Veins: The blood vessels that carry blood to the heart.

This was about the blood vessels and heart. Learn more about the structure and function of the heart by downloading download Byju’s-The Learning App.

Practise This Question

Match the following:
1. Rate of Emission        I. Temperature of the Surroundings
2. Rate of Absorption      II. Temperature of the Body