Why is Blood Red?

The video explores why human blood is red, focusing on the role of red blood cells (RBCs) and hemoglobin. It explains that RBCs are abundant in blood and contain hemoglobin, a protein rich in iron that binds oxygen, giving blood its red color. The video also touches on the different blood colors in animals due to various pigments, such as hemocyanin in crabs and billiverdin in skinks. It concludes by encouraging viewers to donate blood and save lives.

What is the primary reason for the red color of human blood?

• The presence of platelets

• The presence of plasma

• The high ratio of red blood cells

• The presence of white blood cells

What is the function of hemoglobin in red blood cells?

• To fight infections

• To transport oxygen

• To clot blood

• To provide energy

Why is it important to maintain high hemoglobin levels?

• To improve digestion

• To enhance oxygen transport

• To increase blood pressure

• To reduce cholesterol

Which pigment is responsible for the blue color of some animal blood?

• Hemocyanin

• Chlorophyll

• Biliverdin

• Hemoglobin

What is a unique feature of red blood cells in humans?

• They have a nucleus

• They are blue in color

• They are the smallest cells in the body

• They lack a nucleus