First line of defense- Immune system

What is the primary physical barrier of the first line of defense in the immune system?

• a) Antibodies

• b) Skin and mucous membranes

• c) White blood cells

• d) Complement proteins

Which of the following is NOT part of the body's first line of defense?

• a) Cough reflex

• b) Fever response

• c) Saliva containing lysozyme

• d) Mucus production

What is the purpose of mucus in the respiratory and digestive tracts as part of the first line of defense?

• a) To transport oxygen to cells

• b) To trap and remove pathogens

• c) To aid in digestion

• d) To regulate temperature

Which of the following is a function of the first line of defense in the skin?

• a) Production of antibodies

• b) Phagocytosis of pathogens

• c) Chemical barriers

• d) Hematopoiesis

What enzyme found in tears and saliva helps to break down bacterial cell walls and is part of the first line of defense?

• a) Insulin

• b) Lipase

• c) Amylase

• d) Lysozyme

Which of the following is an example of a physical barrier in the first line of defense?

• a) Inflammatory response

• b) Fever

• c) Skin

• d) Phagocytosis

The acidic environment of the stomach is part of the first line of defense because it:

• a) Promotes nutrient absorption

• b) Neutralizes pathogens

• c) Kills many ingested pathogens

• d) Facilitates gas exchange

1. What is the primary role of the cilia in the respiratory tract as part of the first line of defense?

• 1. a) To filter out dust particles

• 1. b) To regulate blood pressure

• 1. c) To produce antibodies

• 1. d) To sweep away mucus and trapped pathogens