Deck 43: Integration of Cardiac Output and Venous Return

Question 1

The m ean systemic pressure is

A) The average of the ce ntral venous press ure and m ean arterial pressure
B) M easu red w ith the hea rt stop ped and bloo d red istribute d so that flo w is zero
C) M ea su re d in the righ t atr ia d ur ing dia sto le
D) M ea su re d in the ce ntr al v ein s d ur ing sys tole
E) The average pressure in the central veins

Answer 1

B

Question 2

Which is NOT part of the sympathetic effects on cardiovascular system?

A) Incre ase d he art rate
B) Vasoconstriction
C) Incre ase d ca rdiac con tractility
D) Incr eas ed filtratio n co effic ient acro ss c ap illary w alls
E) Venoconstriction

Answer 2

D

Question 3

At steady-state, the flow through the pulmonary circulation

A) Is the sam e as the ca rdiac ou tput
B) Exceeds the cardiac output by the flow to the liver
C) Exceeds the cardiac output by the flow to the lung
D) Is the cardiac output minus the flow to the liver
E) Is the cardiac output minus the flow to the lung

Answer 3

A

Question 4

Most of the total peripheral resistance (TPR) is in the

A) Major arteries
B) Sm all arteries
C) Arterioles
D) Capillaries
E) Veins

Question 5

The com pliance of the veins is much greater than the compliance of the arteries because

A) Veins have ellipsoidal cross sections and not circular cross sections
B) Veins are larger
C) Arteries are stiffer
D) Arteries have more parasympathetic innervation
E) The pressure is lower on the venous side

Question 6

The vascular function curve is traditionally plotted as flow on the ordinate against the right atrial pressure on the abscissa. In this case, venoconstriction

A) Decreases the X-intercept
B) Increases the X-intercept
C) Decreases the slope
D) Increases the slope
E) Both A and C are true

Question 7

The vascular function curve is traditionally plotted as flow on the ordinate against the right atrial pressure on the abscissa. In this case, decreasing the TPR

A) Decreases the X-intercept
B) Increases the X-intercept
C) Decreases the slope
D) Increases the slope
E) Both A and C are true

Question 8

At steady-state, the cardiac output

A) Is equal to TPR / MAP
B) Is eq ual to th e flow in the a bdo m inal ao rta
C) Is equ al to v eno us re turn
D) Determ ines the pulse pressu re
E) De term ines the p ulse veloc ity

Question 9

The plate au a t the hig h flow end of the vas cula r fun ction c urve is due to

A) Limited flow because of the reduced pressure gradient
B) High flow due to Increase d arterial pressure
C) Limit to flow caused by partial collapse or flutter of the veins
D) Failure of the muscle pumps to keep up
E) Low pressure caused by venodilation

Question 10

The vascular function curve is traditionally plotted as flow on the ordinate against the right atrial pr es su re on the ab sc iss a. In this ca se , the X- inte rc ep t is

A) W here the veins collapse or flutter
B) Equal to C V / CA
C) 1 / TPR
D) - (1 + C V/ CA) / TPR
E) The m ean system ic pres sure

Question 11

Sym path etic stim ulation sho uld ha ve w hich of the followin g eff ects

A) Increase in PMS because of vasoconstriction
B) Increase in PMS because of venoconstriction
C) Increase in PMS bec aus e of in cre ase d ca rdiac con tractility
D) Decrease in PMS because of Increased TPR
E) Decrease in PMS becaus e of decrea sed slope of the vas cular function curve

Question 12

In p er so ns with a h ypo fu nc tion al h ea rt (w ea k c on tra ctility) , the ca rd iac ou tpu t is p ar tially compensated for by

A) An inc rease in the rig ht atrial p ressu re
B) An Increase in arterial pressure
C) Incre ase d ca rdiac con tractility
D) Vasodilation driven by sympathetic stimulation
E) Decre ased interstitial fluid pressure

Question 13

The vascular function curve is traditionally plotted as flow on the ordinate against the right atrial pr es su re on the ab sc iss a. In this ca se , the slo pe of t he line ar po rtio n o f th e c ur ve is

A) - 1 + CV / CA
B) C V / CA
C) 1 / TPR
D) - (1 + C V/ CA) / TPR
E) 1/(CV + CA)

Question 14

The vascular function curve is traditionally plotted as flow on the ordinate against the right atrial pressure on the absc issa. In this case , the slope of the linear portion of the curve

A) Increases with Increases in TPR
B) Increases with decreases in TPR
C) Increases its X-intercept with Increases in TPR
D) Decreases its X-intercept with Increases in TPR
E) Both A and C are true