Chapter 12
Vitamin B is important for the production of red blood cells because it is utilized in the synthesis of
DNA
Vitamin B12 is important for the production of red blood cells because it is utilized in the synthesis of intrinsic factor.
False
Erythroblastosis fetalis can be prevented by treating
Rh-negative mothers with anti-Rh agglutinin.
A primary function of lymphocytes is to
act against foreign substances
Type AB blood contains
agglutinogen A and B
The most abundant type of plasma protein is
albumin
Nonprotein nitrogenous substances include
amino acids, urea, uric acid
Sickle-cell anemia is caused by
an abnormal form of hemoglobin.
Which of the following usually accounts for the smallest percentage of leukocytes in a blood sample?
basophils
When hemoglobin molecules are decomposed, a greenish pigment called _______ is formed
biliverdin
The condition called cyanosis is caused by an increased blood concentration of
carbon dioxide
Platelets are best defined as
cytoplasmic fragments of cells
The test in which the percentages of various types of leukocytes in a blood sample is determined is the ____________ white blood cell count
differential white blood cell test
The hormone released from the kidneys that promotes the production of red blood cells is
erythopiontien
Prothrombin time is a blood test used to evaluate
extrinsic clotting factor.
A platelet plug is formed when fibrinogen is converted to fibrin.
false
A red blood cell contains a large nucleus; it is thicker near the center and thin around the rim of the cell.
false
Persons with type AB blood are sometimes called universal donors
false
The basic event in the formation of a blood clot is the change of
fibrinogen to fibrin
The most important action of plasma albumins is
helping to maintain blood osmotic pressure
_________ is a blood clot-inhibiting substance released by basophils
heparin
__________ is the term used to describe the stoppage of bleeding by any one of several means
homeostasis
The form of anemia that is caused by a lack of dietary iron is called
hypochromic anemia.
If body cells lack LDL receptors, the plasma concentration of LDL molecules
increases and the blood cholesterol concentration increases.
Which of the following elements is included in hemoglobin molecules?
iron
Pus is composed of
leukocytes, bacteria, damaged body cells
An abnormally low white blood cell count is called
leukopenia
Which of the following is an agranulocyte?
monocyte
Normally the most common type of leukocyte in a blood sample is the
neutrofill
The most active phagocytic cells among the leukocytes are
neutrophils and monocytes
Newborns are sometimes exposed to fluorescent light as a treatment for
physiologic jaundice
Patients with leukemia have a tendency to bleed because they have a deficiency of
platelets
The condition called thrombocytopenia is due to a deficiency o
platelets
The biconcave cells in blood that lack nuclei when they are mature are the
red blood cells
In an adult, red blood cells are produced primarily in the
red bone marrow
As a platelet plug forms, platelets release the vasocontricting substance called
serotonin
Of the plasma electrolytes, the most abundant are
sodium and chloride ions
Which of the following serves as an enzyme in the blood coagulation mechanism?
thrombin
Cells that move toward chemicals released by damaged cells are said to demonstrate positive chemotaxis.
true
Heparin functions as an anticoagulant by interfering with the formation of prothrombin activator.
true
Two substances that are useful for dissolving blood clots are
urokinase and streptokinase.
The normal white blood cell count is between
5,000-10,000 per cubic millimeter of blood
