Answer to Question 1
Cytotoxic T cells attack and destroy body cells infected with viruses or intracellular bacteria. They can also attach cancer cells. Delayed hypersensitivity cells respond to foreign antigens processed by macrophages or similar cells by accumulating at the site of the antigenic material, where they secrete a variety of lymphokines that attract macrophages, activate them, and stimulate them to secrete additional cytokines.
Answer to Question 2
Hyperplasia: increase in cell size with an increase in cell number
Hypertrophy: increase in cell size without an increase in cell number
This diagram shows a cross-section of a solar-type star.
Characteristics of the three types of muscles.
Two main types of nerve cells.
Toe types
The watery interior of cells
Number of cells in the brain