multiple choice questions exam 3 Flashcards
which statement does not accurately describe veins?
a) veins always carry deoxygenated blood
b) veins have a thinner smooth muscle layer than arteries
c) inferior and superior vena cava connect to the right atrium
d) some larger veins have valves
e) when empty, veins walls tend to collapse (lose their rounded shape)
a) veins always carry deoxygenated blood
While most veins do carry deoxygenated blood, the pulmonary veins are an exception as they carry oxygenated blood from the lungs to the heart.
in the heart of the problem, mr. helms suffers from a mitral (left atrioventricular or bicuspid) valve malfunction. how will that affcet his arterial blood pressure?
a) arterial BP will increase
b) arterial BP will decrease
c) arterial BP will stay the same
d) arterial BP will go down to zero
a) arterial BP will increase because loss of stroke volume (less blood sent into the aorta) results in an increased HR, which varies proportionally with BP
which statement is incorrect regarding blood pressure measurement?
a) sounds of korotkoff are heard when the pressure gage indicates 160 mmHG
b) turbulent flow in arteries causes the sounds of korotkoff to be heard
c) a fully opened artery is silent
d) a normal BP measurement is close to 120/80 mmHG
e) diastolic pressure is alwyas lower than systolic pressure
a) sounds of korotkoff are heard when the pressure gage indicates 160 mmHG
The sounds of Korotkoff are typically heard when the cuff pressure is between the systolic and diastolic pressures, not necessarily at 160 mmHg
true or false?
systolic BP is measured whrn the ventricles contract and diastolic BP is measured when the heart relaxes
true
on an ECG tracing, which deflections represnet depolarizing events?
a) T wave
b) P wave
c) QRS complex
d) QRS complex and T wave
e) QRS complex and P wave
e) QRS complex and P wave
(depolarization of ventricles and depol. of atria)
which blood proteins form the final mesh over the platelet plug in coagulation?
a) thrombinogen and thrombin
b) platelets and erythrocytes
c) collagen and elastic fibers
d) prothrombin and prothrombin activator
e) fibrinogen and fibrin
e) fibrinogen and fibrin
true or false
a capillary bed is filled with blood when the precapillary sphincters are opened
true
true or false
platelets are like other cells of the body; they only are of a smaller size
False.
Platelets are not like other cells of the body. They are actually small, disc-shaped cell fragments without a nucleus or organelles. They are derived from larger cells called megakaryocytes in the bone marrow
when both sets of semilunar valves are open, which of the following are also occuring?
1) atria contract
2) blood enters pulmonary trunk
3) blood enters aorta
4) ventricular diastole
5) ventricular systole
6) bicuspid and tricuspid valves are closed
7) coronary arteries fill
a) 1-2-5-7
b) 2-3-5-6
c) 2-5-6-7
d) 1-3-4-6
e) 3-4-6-7
b) 2-3-5-6
blood enters pulmonary trunk
blood enters aorta
ventricular systole
bicuspid and tricuspid valves are closed
true or false
secretion of bicarbonate ions (HCO3-) is necessary to increase blood pH
false
reabsorption of bicarbonate ions will cause an increase in blood pH (alkalinization)
true or false
an embolus is part of a thrombus (blood clot) that has detached and now blocks an arteriole
True.
An embolus is indeed a part of a thrombus (blood clot) that has detached and travels through the bloodstream. When it lodges in and blocks a smaller blood vessel, such as an arteriole, it can cause an embolism
