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66 terms

Test chapter 17 and 18 Multiple choice

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Which of the following is a pivotal
molecule associated with the external surfaces of aggregated platelets and is involved in the intrinsic and extrinsic mechanisms of blood clotting?
PF3
What is the average normal pH range
of blood?
7.4
Which of the choices below is the parent cell for all formed elements of blood?
hemocytoblast
Which blood type is called the universal donor?
O
Which of the following is a regulatory
function of blood?
maintenance of normal PH in body tissues
Which of the following is a protective
function of blood?
prevention of blood loss
Which of the following might trigger
erythropoiesis?
hypoxia of EPO - producing cells
As red blood cells age ________.
membranes wear out and cells become damaged
An individual who is blood type AB
negative can ________.
receive any blood type in moderate amounts except that with the Rh antigen
The most abundant plasma protein is ________.
albumin
When neither anti-A sera nor anti-B
sera clot on a blood plate with donor blood, the blood is type ________.
O
Select the correct statement
regarding blood cell formation.
red marrow is the main side of blood cell formation throughout adult life
James has a hemoglobin
measurement of 16 g/100 ml blood. This is ________.
within normal range
Which of these is not a normal
plasma protein?
Thromboplastin
All of the following can be expected
with polycythemia except ________.
low blood viscosity
No visible cytoplasmic granules are
present in ________.
monocytes
Which of the following is not a phase
of hemostasis?
fibrinolysis
Place the following in correct
developmental sequence:
1. reticulocyte
2. proerythroblast
3. normoblast
4. late erythroblast
proerythroblast, late erythroblast, normoblast, reticulocyte
The slowest step in the clotting
process is ________.
formation of pro thrombin activator
Thromboembolic disorders ________.
include embolus formation, a clot moving within the circulatory system
Which of the following is not a cause
of bleeding disorders?
excess secretion of platelet-derived growth factor (PDGF)
Which of the following is
characteristic of all leukocytes?
They are nucleated
Which of the following is true about
blood plasma?
Its about 90% water
Platelets _______.
stick to the damaged area of blood vessel and help seal the break
which sequence is correct for the following events?
formation of thromboplastin, prothrombin, thrombin, fibrinogen, fibrin, clot retraction
Fred's blood was determined to be
AB positive. What does this mean?
There are no antibodies to A, to B, or to Rh antigens in the plasma
All of the following conditions impair
coagulation except ________.
vascular spasm
When can erythroblastosis fetalis not
possibly happen in the child of an Rh negative mother?
if the father is Rh-
Blood is a ________.
suspension.
What organ in the body regulates
erythrocyte production?
Kidney
Normal heart sounds are caused by
which of the following events?
The closure of the heart valves
Which of the events below does not
occur when the semilunar valves are open?
Ventricles are in diastole
Hemorrhage with a large loss of
blood causes ________.
a lowering of blood pressure due to change in cardiac output; shock
The left ventricular wall of the heart is
thicker than the right wall in order to ________.
pump blood with greater pressure
Damage to the ________ is referred to as heart block.
AV node
The P wave of a normal
electrocardiogram indicates ________.
atrial depolarization
Blood within the pulmonary veins
returns to the ________.
left atrium
Small muscle masses attached to
the chordae tendineae are the ________.
papillary muscles
The term for pain associated with
deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ________.
angina pectoris
To auscultate the aortic semilunar
valve, you would place your stethoscope in the ________.
second intercostal space to the left of the sternum
The source of blood carried to
capillaries in the myocardium would be the ________.
coronary arteries
The fact that the left ventricle of the
heart is thicker than the right ventricle reveals that it ________.
pumps blood against a greater resistance
Which of the following factors does
not influence heart rate?
Skin color
Which of the following is not an
age-related change affecting the heart?
thinning of the valve flaps
If cardiac muscle is deprived of its
normal blood supply, damage would primarily result from ________.
decreased delivery of oxygen
If the length of the absolute refractory
period in cardiac muscle cells was the same as it is for skeletal muscle cells ________.
tetanic contractions might occur, which would stop the heart's pumping action
Norepinephrine acts on the heart by
________.
causing threshold to be reached more quickly
If the vagal nerves to the heart were
cut, the result would be that ________.
the heart rate would increase by about 25 beats per minute
Which vessel of the heart receives
blood during right ventricular systole?
pulmonary trunk
Which of these vessels receives
blood during ventricular systole?
both the aorta and pulmonary trunk
Which of the following is not part of
the conduction system of the heart?
AV valve
When viewing a dissected heart, it is
easy to visually discern the right and left ventricles by ________.
noticing the thickness of the ventricle walls
Normal Heart Rate_____.
60-100 BPM
Select the correct statement about
the heart valves.
The AV valves are supported by chordae tendinae so that they do not blow back up into the atria during ventricular contraction.
Select the correct statement about
the function of myocardial cells.
The all-or-none law as applied to cardiac muscle means that the entire heart contracts as a unit or it does not contract at all.
Select the correct statement about
the structure of the heart wall.
The myocardium is the layer of the heart that actually contracts.
Compared to skeletal muscle,
cardiac muscle ________.
has gap junctions that allow it to act as a functional syncytium
During the period of ventricular filling
________.
blood flows passively through the atria and the open AV valves
The second heart sound is heard
during which phase of the cardiac cycle?
isovolumetric relaxation
The time of day most hazardous for
heart attacks is ________.
morning
If we were able to artificially alter the
membrane permeability of pacemaker cells so that sodium influx is more rapid, ________.
threshold is reached more quickly and heart rate would increase
Select the correct statement about
cardiac output.
A slow heart rate increases end diastolic volume, stroke volume, and force of contraction.
During contraction of heart muscle
cells ________.
some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
Isovolumetric contraction ________.
occurs when cardiac muscles are contracting and exerting force, but are not yet shortening; both the SL and AV valves are closed
Sickling of red blood cells can be
produced in those with sickle-cell anemia by ________.
Travel at high altitude and vigorous exercise
The special type of hemoglobin
present in fetal red blood cells is ________.
Hemoglobin F