Which of the following is an example of an immune response?

• A. Absorption of nutrients in the small intestine
• B. Production of antibodies by B cells after exposure to a pathogen
• C. Filtration of blood in the kidneys
• D. Transmission of nerve impulses along a neuron

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the concept of an immune response. The immune response is the body's defense mechanism against pathogens, such as bacteria, viruses, or other harmful agents. It involves recognizing and neutralizing these invaders to protect the body.
2. Step 2: Review the options provided in the question. The first option, 'Absorption of nutrients in the small intestine,' is a digestive process and not related to the immune system. The second option, 'Production of antibodies by B cells after exposure to a pathogen,' is directly related to the immune system and represents an adaptive immune response.
3. Step 3: Analyze the third option, 'Filtration of blood in the kidneys.' This is a function of the excretory system and involves removing waste products from the blood, not an immune response.
4. Step 4: Examine the fourth option, 'Transmission of nerve impulses along a neuron.' This is a function of the nervous system and is unrelated to the immune system.
5. Step 5: Conclude that the correct example of an immune response is 'Production of antibodies by B cells after exposure to a pathogen,' as it directly involves the immune system's adaptive response to neutralize pathogens.