Which of the following are the components of blood that help protect against pathogens and aid in blood clotting?

• A. Red blood cells and plasma
• B. Enzymes and hormones
• C. White blood cells and platelets
• D. Hemoglobin and antibodies

Answer: (C)

Verified step by step guidance

1. Step 1: Begin by understanding the components of blood and their functions. Blood is composed of plasma, red blood cells, white blood cells, and platelets, each serving distinct roles in the body.
2. Step 2: Focus on the role of white blood cells. White blood cells (leukocytes) are part of the immune system and help protect the body against pathogens such as bacteria, viruses, and other harmful microorganisms.
3. Step 3: Examine the role of platelets. Platelets are small cell fragments that play a crucial role in blood clotting by forming a plug at the site of injury and releasing chemicals that help stabilize the clot.
4. Step 4: Compare the options provided in the question. Red blood cells and plasma primarily transport oxygen and nutrients, enzymes and hormones regulate metabolic processes, hemoglobin carries oxygen, and antibodies are proteins that help fight infections but are not directly involved in clotting.
5. Step 5: Conclude that the correct answer is white blood cells and platelets, as they are the components of blood responsible for protecting against pathogens and aiding in blood clotting.