Multiple Choice
Which of the following is considered a physical barrier in the immune system?
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41. Immune System
Immune System
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The lymph nodes help protect the body by which of the following?
A
Filtering lymph to remove pathogens and foreign particles
B
Generating electrical impulses for muscle contraction
C
Secreting digestive enzymes into the small intestine
D
Producing insulin to regulate blood sugar
Verified step by step guidance1
Understand the role of lymph nodes in the immune system. Lymph nodes are small, bean-shaped structures that are part of the lymphatic system. Their primary function is to filter lymph, a fluid containing white blood cells, to remove pathogens and foreign particles.
Eliminate incorrect options based on the functions of lymph nodes. For example, lymph nodes do not generate electrical impulses for muscle contraction, as this is the role of the nervous system.
Recognize that lymph nodes do not secrete digestive enzymes into the small intestine. This function is performed by organs like the pancreas and the small intestine itself.
Understand that lymph nodes do not produce insulin to regulate blood sugar. Insulin is produced by the beta cells in the pancreas.
Conclude that the correct answer is: Filtering lymph to remove pathogens and foreign particles, as this aligns with the primary function of lymph nodes in the immune system.
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