Cardio Physiology Practice Questions

Calculate the cardiac output of a patient with a heart rate of 100 beats/minute and a stroke volume of 75 ml.

7500 ml/min

Hypertension increases ________ causing stroke volume to ________.

after load; decrease

If the force of ventricular contraction increases, what will happen to the end-systolic volume?

decrease

A tumor on the adrenal gland increasing catecholamine release will cause all of the following cardiovascular responses except

decreased heart rate

Cardiac output can be increased by all of the following except

decreasing ejection fraction

Which of the following would cause stroke volume to increase?

drugs that stimulate beta-1 receptors

Each of the following factors will increase cardiac output except increased

parasympathetic stimulation

Stroke volume depends on all of the following factors except

respiratory rate

The volume of blood ejected from each ventricle during a contraction is called the

stroke volume

Cardiac output is increased by

sympathetic stimulation

Which factor directly influences preload?

venous return

The principle that increasing the end-diastolic volume results in a corresponding increase in the stroke volume is known as

Frank-Starling principle

Which of the following would not increase heart rate?

beta blocking drugs

An increase in the rate of action potentials from baroreceptors will trigger a reflex to

both decrease heart rate and decrease pressure

Positive inotropic drugs such as glucagon and thyroid hormone cause

increased contractibility