What Is Blood?

The video explores the diversity of blood colors across species, explaining that blood can be red, blue, green, or clear depending on its components. It delves into the composition of blood, highlighting the roles of plasma, red blood cells, white blood cells, and platelets. Plasma, primarily water, transports nutrients and heat, while red blood cells, containing hemoglobin, carry oxygen. White blood cells defend against pathogens, and platelets aid in clotting. The video concludes by emphasizing that blood color is determined by the proteins present in red blood cells.

Which of the following species is known to have blue blood?

• Humans

• Octopuses

• Sharks

• Icefish

What percentage of blood is made up of plasma?

• 45%

• 70%

• 55%

• 92%

What is the primary function of hemoglobin in red blood cells?

• To clot blood

• To fight infections

• To carry oxygen

• To transport nutrients

What process do phagocytes use to engulf foreign pathogens?

• Oxygenation

• Hemostasis

• Antibody production

• Phagocytosis

What is the main role of platelets in the blood?

• Carrying nutrients

• Fighting infections

• Clotting blood

• Transporting oxygen