List the components of blood: red blood cells, white blood cells, platelets and plasma.

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8.2 Transport in Humans: Components of Blood

Blood is a vital fluid that transports substances throughout the human body. It is composed of several different components, each with a specific function. These components work together to ensure the delivery of oxygen, nutrients, hormones, and immune cells, as well as the removal of waste products.

Components of Blood

Blood can be divided into four main components:

  • Red Blood Cells (Erythrocytes): Responsible for oxygen transport.
  • White Blood Cells (Leukocytes): Involved in the immune system and fighting infection.
  • Platelets (Thrombocytes): Essential for blood clotting.
  • Plasma: The liquid component of blood, which carries the blood cells and other substances.

Detailed Information on Blood Components

Component Main Function Key Features
Red Blood Cells Oxygen transport Contain haemoglobin, which binds to oxygen. Biconcave disc shape for increased surface area. No nucleus in mature cells.
White Blood Cells Immune defence Fight infection and disease. Different types of white blood cells have different roles (e.g., neutrophils, lymphocytes). Have a nucleus.
Platelets Blood clotting Small, cell fragments. Adhere to damaged blood vessel walls to form a clot.
Plasma Transport medium Liquid portion of blood. Contains water, proteins, nutrients, hormones, and waste products.

Figure: Suggested diagram: A diagram showing the four components of blood with labels indicating their functions.

Understanding the different components of blood is crucial for comprehending how the circulatory system functions effectively.