Chapter 24 The Body's Defenses

Question 1

What are the three lines of defense?

Answer 1

External Barriers (innate)
Internal defenses (innate)
Adaptive

Question 2

What are some examples of external defenses?

Answer 2

Skin, Secretions, Mucous membranes

Question 3

What are some examples of internal defenses?

Answer 3

Inflammatory response, Phagocytic cells, Natural killer cells, and Defensive proteins

Question 4

What are some examples of adaptive defenses?

Answer 4

Lymphocytes (T and B cells) and antibodies

Question 5

What are natural killer cells?

Answer 5

Cells that destroy infected and cancerous body cells. Recognize virus-infected cell and release chemicals that kill diseased cells.

Question 6

T-Cells

Answer 6

Involved with cell mediated immunity

Question 7

B-Cells

Answer 7

humoral immunity (originate in bone cells)

Question 8

What are the basic functions of antibodies?

Answer 8

Immobilize invading cells, tag for destruction, combine i with an antigen to form an antigen-antibody complex, treat disorders of the immune system, treat certain cases of aggressive cancer, and detect pregnancy in home testing kits.

Question 9

What are autoimmune disorders?

Answer 9

The immune system attacks our own tissues and tissues transplanted in our bodies.
Ex. rheumatoid arthritis

Question 10

Which types of cells are preferentially infected by HIV?

Answer 10

Helper T-cells