McCumbee - Integrated Control

Question 1

The amount of blood that enters the right atrium per minute

Controlled by the sum of all individual factors regulating local blood flow

Answer 1

Venous return

Question 2

_______ is the principle regulator of cardiac output, within normal physiological limits

Answer 2

Venous return

Question 3

Conditions that can cause a heart to be hypereffective:

Answer 3

Sympathetic stimulation

Athletic conditioning

Question 4

Conditions that can cause a heart to become hypoeffective

Answer 4

Decreased sympathetic stimulation

Increased arterial pressure (HTN)

Reduced ventricular filling (cardiac tamponade, pericardial effusion)

Heart disease

Coronary hypoxia

Abnormal heart rhythm

Question 5

Cardiac output is ___________ to peripheral resistance

Answer 5

Inversely related

Question 6

The blood pressure in the thoracic venae cavae at the entrance of the right atrium

Answer 6

Central venous pressure

[ this is slightly higher than right atrial pressure ]

Question 7

Factors affecting venous return to the heart?

Answer 7

Right atrial pressure

Mean systemic filling pressure

Resistance to flow between peripheral vessels and the right atrium

Question 8

The point were the venous function curve crosses the x axis

Answer 8

Mean systemic filling pressure

Question 9

Conditions that directly alter the venous return curve

Answer 9

A change in blood volume

A change in venous tone

Resistance to venous return

Question 10

The difference between right atrial pressure and the mean systemic filling pressure (Psf) is __________

Answer 10

The driving force for venous return