FlyingStart MEDSCI142: CVS Physiology

The formula for cardiac output is?

• CO = HR x BP

• CO = SV x Resistance

• CO = contractility vs HR

• CO = HR x SV

What is NOT a regulation mechanism of stroke volume?

• Preload

• Systole

• Contractility

• Afterload

An increase in afterload leads to? (multiple)

• Increased preload in the next cardiac cycle

• Decrease contractility

• Increased HR

• decreased stroke volume

Stroke volume can be represented on this graph by?

• The height of the curve

• The width of the curve

• The area of the curve

• The difference between point A and B

How will increasing preload affect the shape of the pressure volume curve?

• Taller on y-axis

• Longer on x-axis

• Shorter on x-axis

• Shorter on y-axis

What phase of the cardiac action potential is not found in the nervous AP?

• Refractory period

• Plateau phase

• Repolarisation

• Rapid depolarisation

The PR segment on an ECG represents?

• Atrial depolarisation

• Ventricular depolarisation

• Ventricular systole

• Atrial systole

The sympathetic EFFERENT nerves affecting the vasculature are called?

• Glossopharyngeal nerve

• Vagus nerve

• Cardiac accelerator nerves

• Vasomotor nerves

Which type of receptors monitor blood pressure?

• Proprioceptors

• Baroreceptors

• Chemoreceptors

• Mechanoreceptors

True or false:

Decreasing parasympathetic nervous activity can increase heart rate before an increase in sympathetic nervous activity

• True

• False