What are the components of the transport system in human beings? What are the functions of these components?
Hint: The human circulatory system is responsible for moving water and materials throughout and out of the body.
Complete Answer:
The human transport system consists of three primary components: the heart, the blood that circulates, and the network of blood vessels.
- Heart: The heart functions as the central pump, pushing oxygen-rich blood throughout the body. It collects deoxygenated blood from different areas, which is then sent to the lungs for oxygenation.
- Blood vessels: Blood vessels serve as the pathways for blood circulation across the body. They are of two main types:
There are two types of blood vessels:
- a) Veins:
These thin, elastic vessels are located near the skin’s surface and carry deoxygenated blood from the body back to the heart, with the exception of the umbilical and pulmonary veins, which transport oxygenated blood.
Arteries: Also thin and elastic, arteries branch into smaller capillaries and transport oxygenated blood from the heart to the rest of the body, except the pulmonary artery, which carries deoxygenated blood to the lungs.
- Blood: Blood is a fluid connective tissue involved in transporting oxygen, carbon dioxide, nutrients, and waste products. It is made up of plasma, white blood cells, red blood cells, and platelets.
Note: The circulatory system serves the following functions:
- It transports blood, nutrients, oxygen, and carbon dioxide across the body.
- It aids in defending against various pathogens.
- It is crucial for the maintenance of all organ systems.
- It also facilitates the distribution of hormones throughout the body.