The Components and Functions of Blood

The video explains that the human body contains about five liters of blood, which appears red but is composed of various elements. Under a microscope, blood reveals plasma, red blood cells, white blood cells, and platelets. Plasma, mostly water, carries essential substances like vitamins and minerals. Red blood cells transport oxygen, while white blood cells fight infections. Platelets, cell fragments, play a crucial role in clotting to stop bleeding by forming a net over injuries.

How much blood is typically found in the human body?

• Seven liters

• Five liters

• Ten liters

• Three liters

What is the primary component of plasma?

• Oxygen

• Proteins

• Water

• Glucose

Which type of blood cell is responsible for transporting oxygen?

• White blood cells

• Plasma cells

• Platelets

• Red blood cells

What is the main function of white blood cells?

• Transporting nutrients

• Carrying oxygen

• Fighting infections

• Clotting blood

What role do platelets play in the body?

• Carrying oxygen

• Fighting infections

• Clotting blood

• Transporting nutrients