Deck 43: Blood Testing

Question 1

When a blood sample is spun down in a centrifuge tube, what is found in the buffy coat?

A)Blood plasma
B)Red blood cells
C)Platelets
D)Red blood cells and platelets
E)White blood cells and platelets

Answer 1

E

Question 2

All of the following factors could cause decreased hematocrit except

A)anemia.
B)smoking or emphysema.
C)kidney disease with a decline in erythropoietin production.
D)a hemorrhage.
E)All of these could cause decreased hematocrit.

Answer 2

B

Question 3

A normal average hematocrit in a male is about

A)15%.
B)45%.
C)25%.
D)<1%.
E)55%.

Answer 3

B

Question 4

The primary determinating factor for total blood cholesterol level is

A)heredity.
B)obesity.
C)lack of exercise.
D)a high cholesterol diet.
E)All of these factors contribute equally to the total blood cholesterol level.

Question 5

When a blood sample is spun down in a centrifuge tube, the blood plasma settles to the bottom, due it is high viscosity.

Question 6

The binding site for oxygen molecules in red blood cells is the globin portion of the hemoglobin molecules.

Question 7

The blood clotting cascade is initiated by chemicals released by

A)normal cells in the vicinity of the broken blood vessel.
B)injured tissues and platelets.
C)red blood cells in the area.
D)fibroblasts in the vicinity of the broken blood vessel.
E)pathogenic microorganisms in the area.

Question 8

Which of the following is not true of cholesterol?

A)For the best health, it is recommended that the LDL and HDL levels in the blood should be as low as possible.
B)A cholesterol level of greater than 200 mg/dl is associated with an increase in the likelihood of developing cardiovascular disease.
C)LDLs are molecules that transport cholesterol to the tissues for use by the cells.
D)HDLs are molecules that are transported to the liver for decomposition and removal from the body.
E)All of these are true of cholesterol.

Question 9

On the average, males have a slightly higher hematocrit than females.

Question 10

According to the oxygen dissociation curve for temperature, the higher the temperature, the higher the percent saturation of hemoglobin for any partial pressure of oxygen.

Question 11

During hemostasis, the final stage of blood coagulation involves

A)the conversion of prothrombin to thrombin.
B)the formation of a platelet plug.
C)the conversion of fibrinogen to fibrin.
D)blood vessel spasm.
E)the secretion of serotonin.

Question 12

A complete blood count (CBC)measures all of the following except

A)the white blood cell count.
B)the hematocrit.
C)the hemoglobin concentration.
D)the red blood cell count.
E)the percentages of each type of white blood cell.

Question 13

Anemia can be caused either by a low hematocrit, or by a low hemoglobin level even when the red blood cell count is normal.

Question 14

The most important factor influencing the percent saturation of hemoglobin is

A)the pH.
B)the temperature.
C)the partial pressure of oxygen.
D)the carbon dioxide level.
E)All of these factors are equally important in determining the percent saturation of hemoglobin.

Question 15

Which of the following is not true of hemoglobin?

A)It makes up about 1/3 of a red blood cell.
B)Each hemoglobin molecule consists of 4 protein subunits.
C)Oxyhemoglobin is bright red, and deoxyhemoglobin is dark red.
D)Each hemoglobin molecule can bind to up to 20 oxygen molecules at a time.
E)All of these are true of hemoglobin.