What is the main role of white blood cells in the immune system?

• To carry oxygen to tissues.

• To produce digestive acids.

• To regulate blood sugar levels.

• To attack and destroy pathogens.

Which of the immune system’s organs is primarily responsible for filtering out old red blood cells?

• Thymus

• Spleen

• Lymph nodes

• Tonsils

What happens in bone marrow as part of the immune system?

• It filters toxins out of the blood.

• It produces stem cells that can become red or white blood cells.

• It stores fat cells for energy.

• It produces digestive enzymes.

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When a pathogen enters the body through a cut, what is the immediate immune response?

• Platelets form a clot to seal the cut and prevent further infection.

• The lungs increase oxygen supply to the blood.

• The digestive system isolates the pathogen to be expelled.

• The nervous system sends signals to increase body temperature.

Why might a doctor recommend the removal of someone’s tonsils?

• Because they started producing too much insulin.

• Because they began absorbing too many nutrients.

• Because they’re getting infected frequently and causing sore throats.

• Because they’re obstructing the passage of air while breathing.

Which of the following symptoms are NOT an indication the body is fighting off pathogens?

• Fever

• Increased appetite

• Vomiting

• Runny nose

Which of the following organs belong to the immune system? Select ALL that apply.

• Tonsils

• Lymph nodes

• Thymus

• Pancreas

• Spleen

Which of the following tissues are a part of the immune system? Select ALL that apply.

• White blood cells

• Nervous tissue

• Muscle tissue

• Lymph tissue

• Bone marrow

Which explanation best supports your above choice about the role of lymph nodes?

• Lymph nodes produce lymph fluid that circulates throughout the body, delivering nutrients.

• Lymph nodes are responsible for producing hormones that regulate the immune response.

• Lymph nodes filter lymph fluid and contain immune cells that destroy pathogens.

• Lymph nodes control the level of oxygen in the blood and remove carbon dioxide.

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What is the main role of white blood cells in the immune system?

• To carry oxygen to tissues.

• To produce digestive acids.

• To regulate blood sugar levels.

• To attack and destroy pathogens.