Table of contents | |
What are Blood Vessels? | |
Types of Blood Vessels | |
Layers of Blood Vessels | |
Difference between Arteries, Veins & Capillaries | |
Functions of Blood Vessels | |
Concept Based Questions |
Blood vessels are intricate networks of hollow tubes that transport blood throughout the entire body.
In the closed type of blood vascular system blood vessels are of 3 major types:
Blood Vessels in Body
Arteries are the main blood vessels that carry and transport oxygenated blood or oxygen-rich blood from the heart to other parts of the body.
Veins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins,
Veins carry deoxygenated blood except for the Pulmonary Vein
Capillaries are tiny blood-containing structures that connect arterioles to venules. They are the smallest and most abundant form of a blood vessel in the body.
Normally there are three layers are found in the walls of blood vessels:
One more layer is present in the wall bigger arteries, that is known as elastic membrane. This is found in between the tunica media and tunica interna layers.
These all layers are well developed in the walls of arteries as compared to the walls of veins.
Walls of arteries are thick and more muscular and these walls are elastic and non-collapsable.
The walls of veins are thin, less muscular non-elastic and collapsable.
In the walls of blood capillaries, only the endothelium layer is found. Its cells are flat and squamous,Their walls are perforated. These blood capillaries join the arteries with the veins.
Blood capillaries were discovered by a scientist named as Marcello Malpighi
A thin network of blood capillaries is present in the walls of blood vessels itself which supply blood and other necessary substances to the blood vessels. This blood supply is known as Vasa-vasorum.
Q1. What are the 3 types of blood vessels and their functions?
Ans: There are three kinds of blood vessels: arteries, veins, and capillaries. Each of these plays a very specific role in the circulation process. Arteries carry oxygenated blood away from the heart. They're tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily.
Q2. What is the largest blood vessel?
Ans: The largest artery is the aorta, which receives blood directly from the heart. Veins are blood vessels that carry blood toward the heart.
Q3. What are the smallest blood vessels?
Ans: Arterioles carry blood and oxygen into the smallest blood vessels, the capillaries. Capillaries are so small they can only be seen under a microscope.
Q4. How do blood vessels work?
Ans: The heart, blood and blood vessels work together to service the cells of the body. Using the network of arteries, veins and capillaries, blood carries carbon dioxide to the lungs (for exhalation) and picks up oxygen. From the small intestine, the blood gathers food nutrients and delivers them to every cell.
Q5. Why the colour of human blood is red?
Ans: Human blood is red because hemoglobin, which is carried in the blood and functions to transport oxygen, is iron-rich and red in color. It's bright red when the arteries carry it in its oxygen-rich state throughout the body. And it's still red, but darker now, when it rushes home to the heart through the veins.
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1. What are Blood Vessels? |
2. What are the Types of Blood Vessels? |
3. What are the Layers of Blood Vessels? |
4. What is the Difference between Arteries, Veins & Capillaries? |
5. What are the Functions of Blood Vessels? |
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