Exam 9: Cardiac Physiology

Match heart characteristic with correct anatomical structure. Choices may be used more than once or not at all. -its cells have slow Ca²⁺ channels

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified. -Is the normal pacemaker of the heart.

The stroke volume is the total volume of blood ejected by both ventricles per minute.

Explain how cardiac tetanus is prevented.

Select the vessel carrying blood with a comparatively high concentration of oxygen.

Match EKG feature with correct characteristic. -Time during which impulse is traveling through the AV node.

Indicate which valve abnormality is being described using the answer code below. -Produces a "whistling" murmur.

Sympathetic stimulation of the heart

The ____________________ is EDV-ESV.

Select the cranial nerve of the parasympathetic nervous system that signals the heart.

Cardiac output

Adjacent cardiac muscle cells are joined together end-to-end in the ventricles by

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code: -increases the heart rate

MATCHING Match term with correct characteristic. -Muscle mass that becomes excited and contracts as a unit.

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified. -Is the only point of electrical contact between the atria and ventricles.

An increase in cardiac sympathetic activity ____________________ the stroke volume.

The cardiac muscle

Parasympathetic stimulation of the AV node increases the speed of transmission of the impulse through the AV node.

The semilunar valves are positioned between the atria and ventricles.

The first heart sound signals the onset of ventricular systole.