Page 194 - 86 human physiology part-2

Appendix A: Answers to Review Questions

10-When a macrophage ingests an invading bacteria and takes the antigen to a lymph node, what
happens next?

A) the macrophage will present it to the first B-cell it encounters, and the B-cell will in turn
change its surface receptors to match the antigen
• B) a B-cell will only become activated if it already has a match for the antigen
C) a matching B-cell will become activated into a cytotoxic T-cell
D) the cells of the lymph node will release histamine
E) the lymph node will increase production of neutrophils

11-What is the most common portal of entry for diseases, into the body?

• A) Respiratory system
B) Endocrine system
C) Hematacrit system
D) Any opening into the body.

12-This gland shrinks in size during adulthood, and has hormones that function in maturation of T-
lymphocytes:

A) lymph nodes
• B) thymus
C) spleen
D) GALT
E) tonsils

13-Which of the following is not a mechanical factor to protect the skin and mucous membranes
from infection?

A) Layers of cells
B) Tears
C) Saliva
• D) Lysozyme
E) None of the above

14-Where is the site of maturation for a B cell?

A) thymus
• B) bone marrow
C) pancreas
D) cortex

15-Nonspecific resistance is

A) The body's ability to ward off diseases.
• B) The body's defenses against any kind of pathogen.
C) The body's defense against a particular pathogen.
D) The lack of resistance.
E) None of the above.

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