Immune & Lymphatic SystemATI TEAS 7 cheat sheet

Defense in three lines

8 key facts 5 practice questions Reviewed Oct 2026

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First Line

Skin and mucous membranes — physical and chemical barriers
Stomach acid, tears, and cilia trap or kill

Second Line

Innate, nonspecific — inflammation, fever, phagocytes
Macrophages and neutrophils engulf invaders

Third Line

Adaptive, specific — lymphocytes
B cells make antibodies; T cells kill infected cells directly
Memory cells give lasting immunity

Lymphatic

Returns excess fluid to the blood, absorbs fats, houses lymph nodes and the spleen

Key takeaway

Defense in three lines

Before you read

Test yourself first: 5 questions

Question 1 of 5

Which organ system is directly responsible for producing antibodies to fight infection?

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