Chapter 21 -1

Question 1

____________ are white blood cells that indiscriminately attack and ingest invaders by engulfing and digesting the invader.

Answer 1

Phagocytes

Question 2

Macrophages are one type of phagocytic white blood cells that moves throughout the lymphatic fluid, engulfing dead and damaged cells, a process called phagocytosis.

Answer 2

True

Question 3

Natural killer cells are nonspecific cells that attack tumor cells and virus-invaded body cells on their ______ exposure.

Answer 3

First

Question 4

____________ promotes increased size of blood vessels, or vasodilation, near the injury.

Answer 4

Histamine