Exam 8: Cardiac Physiology

Match the effects with sympathetic or parasympathetic stimulation (or neither) of the heart. (Options may be used more than once or not at all.) -decreases the contractility of the atrial muscle

An increase in parasympathetic activity ____________________ the atrial contractility.

Cardiac tamponade refers to failure of the AV node to transmit the action potential from the atria to the ventricles.

The ____________________ is the volume of blood in the ventricle when filling is complete.

Indicate the proper order of the events during the cardiac cycle by placing numbers in the blanks preceding the events in sequence.The first and last events are already indicated as a guide. 1__ AV valve open; aortic valve closed; ventricular filling occurring _____ blood ejected from the ventricle _____ isovolumetric ventricular relaxation _____ atrial contraction _____ aortic valve opens _____ SA node discharges _____ ventricular filling complete _____ ventricular relaxation begins _____ aortic valve closes _____ isovolumetric ventricular contraction _____ ventricular contraction begins; AV valve closes _12__ AV valve opens; ventricular filling occurs again; one cardiac cycle is complete

Match the pressure relationships, labelled a. through e., with the times in question. (Options may be used more than once or not at all.) -when the aortic valve opens

When does electrical activity occur at the AV node

The heart utilizes glucose almost exclusively for energy production.

What is the proper sequence of blood flow through the circulatory system 1.right atrium 2.left atrium 3.right ventricle 4.left ventricle 5.pulmonary artery 6.pulmonary vein 7.lungs 8.systemic tissues 9.aorta 10.venae cavae

A condition in which the heart is contracting in an uncontrolled, rapid, and irregular manner is _______________

The extent of myocardial infarction is dependent on ____________________ and ____________________.

The ventricles always depolarize at the same rate as the SA node depolarizes.

The functional syncytia of the myocardium are offered by the intercalated discs.

Which structure is the low-resistance pathway that permits electrical activity to pass from cell to cell in myocardial tissue

Which of these statements applies to the cardiac muscle

Ventricular filling occurs more rapidly early in diastole than it does later in diastole.

Match the anatomical structures, labelled a. through e., with the heart characteristics. (Options may be used more than once or not at all.) -contraction of this generates blood pressure

Which of the following is a function of the aortic valve

Which of these criteria must be met for the heart to function efficiently

An increase in cardiac sympathetic activity ____________________ the rate of depolarization of the SA node.