1. which of the following helps to prevent pathogens from invading the body?
a) histamines
b)mucus
c) t-cells
d) macrophages Ans :: mucus, skin, secretion (first step).
2. A bacteria cell enters the body through a cut in the skin. Which of the
following describes the immune response that would occur next?
a) cytotoxic t-cells
b)helper t-cells are activated
c)histamines are released
d) antigens are released Ans :: histamines (inflammatory response) are released
3. Which of the following types of cells produce antibodies?
a) T-cell
b)plasma-cells
c) memory cells
d) macrophages Ans :: plasma-cells (The helper T cell induces
,the B cell to multiply rapidly into secretory cells called "plasma cells." These plasma cel
will then produce large amounts of an antibody that can bind the antigen.)
4. which of the following best describes the purpose of a vaccine?
A.) To produce extra inflammatory responses such as the release of hista-
mines
B.) To practice passive immunity
C.) To produce antibodies in case of future infection
D.) To increase macrophage production Ans :: to produce antibodies in case of
future infection. (Vaccinations introduce antigens, which are weakened or killed, to
elicit an immune response.)
5. Which of the following parts of the male genitourinary system also trans-
ports sperm?
A. Ureter
B. Urethra
C. Uterus
D. Urinary bladder Ans :: urethra (In males, the urethra passes through the penis
and also carries sperm. Females have a much shorter urethra)
6. Which of the following waste products from digestion does the kidney
remove?
,A. Nitrogen
B. Sodium chloride
C. Protein
, D. Carbon Ans :: nitrogen nitrogenous waste from protein digestion is toxic and
must be removed because it will form ammonia.
7. Which of the following best describes the outcome if the kidneys stopped
functioning?
A. Blood would increase its carbon dioxide concentration.
B. Blood would fill with waste and the human body would not be able to
maintain homeostasis.
C. The kidneys would fill with urine.
D.The frequency in which a human excretes urine would increase. Ans :: blood
would fill with waste and the human body would not be able to maintain homeostasis
8. Which of the following structures is the functional unit of the kidney?
A. Renal capillaries
B. Glomerulus
C. Nephron
D. Cortex Ans :: nephron (The functional unit of the kidney is the nephron.)
9. In two to three sentences, explain the purpose of blood pressure in the
kidney. Ans :: The pressure of the blood helps the glomerulus
filter out wastes and return vital nutrients through the renal vein to the blood.