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Which of the following are part of the first line of defense against invaders: (select all that apply)

A.

Neutrophils

B.

Inflammation

C.

Tears

D.

Saliva

Answer and Explanation

Correct Answer : C,D

A. Neutrophils are part of the second line of defense, not the first. They are white blood cells that respond to infection by phagocytosing pathogens after they have entered the body.
B. Inflammation is part of the second line of defense. It is an immune response that occurs after a pathogen has breached the body's barriers.
C. Tears are part of the first line of defense. They contain enzymes like lysozyme that help wash away and destroy pathogens on the surface of the eye.
D. Saliva is part of the first line of defense. It contains enzymes and antimicrobial substances that help neutralize and flush out pathogens from the mouth.


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Related Questions

Correct Answer is C

Explanation

A. Inguinal nodes are located in the groin area, not the neck.
B. Subclavian nodes are found near the clavicle (collarbone), closer to the chest, not specifically in the neck.
C. Cervical nodes are the correct answer. These lymph nodes are located in the neck and are responsible for filtering lymph from the head and neck region.
D. Palatine tonsil is located in the oropharynx (back of the throat), not in the neck, although it is part of the lymphatic system.

Correct Answer is D

Explanation

A. Lacteal is a lymphatic vessel located in the villi of the small intestine that absorbs fats, not the enlarged portion of the thoracic duct.
B. Hilum refers to the area on an organ where vessels, nerves, or ducts enter or leave, but it is not the enlarged portion of the thoracic duct.
C. The Right lymphatic duct is a separate duct that drains lymph from the right side of the body, not the enlarged portion of the thoracic duct.
D. Cisterna chyli is the enlarged, sac-like structure at the lower end of the thoracic duct, where lymph from the lower body and digestive organs (containing chyle) is collected before being transported into the thoracic duct.

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