Question

Choose the correct direction of blood flow inside the human body.

• A. Heart → Vein → Venule → Capillary → Artery → Arteriole
• B. Heart → Artery → Arteriole → Capillary → Vein → Venule
• C. Heart → Artery → Arteriole → Capillary → Venule → Vein
• D. Heart → Artery → Arteriole → Vein → Venule → Capillary

Answer 1

The correct option is C Heart → Artery → Arteriole → Capillary → Venule → Vein

Heart is a pumping organ which pumps blood throughout the body via a circulatory system supplying oxygen and nutrients to the tissues.
Arteries are the blood vessels which carry blood away from the heart to various organs of the body. Since the blood comes from the heart under high pressure, the arteries have thick, elastic walls.
On reaching an organ or tissue, the artery divides into smaller and smaller vessels called arterioles and further branches to form capillaries to bring the blood in contact with all the individual cells.
Exchange of substances between blood and the surrounding cells takes place across the thin wall of capillaries.
The capillaries join together to form venules which further join to form veins.
Veins collect the blood from different organs and bring it back to the heart. Veins do not need thick walls because the blood is no longer under pressure, instead they have valves that ensure that the blood flows only in one direction.