Exam 9: Cardiac Physiology

MATCHING: ART The following questions refer to the accompanying diagram of the heart. Eight structures (vessels or chambers) labels have been removed and replaced with letters A-H. Match the letter with list of missing terms below to complete the diagram. -right ventricle

The aortic valve prevents backflow of blood from the aorta into the left ventricle during ventricular diastole.

Each of the following factors will increase cardiac output except:

The AV and semilunar valves are never open at the same time.

Blood flow through the coronary circulation occurs

Using the following answer code, indicate which pressure relationship exists during the time in question. -during isovolumetric ventricular contraction

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

MATCHING Match term with correct characteristic. -Area of low electrical resistance that allows an action potential to spread from one cardiac cell to surrounding cells.

Sympathetic stimulation of the heart increases only the force of contraction.

The left ventricle contracts with more force than the right ventricle, but the right ventricle pumps more blood per contraction.

Use the following answer code to compare the magnitude of the items in question. -A. volume of blood in the left ventricle when the aortic valve opens B. volume of blood in the left ventricle when the aortic valve closes

Sympathetic stimulation of the heart increases calcium permeability.

At rapid heart rates,

Use the answer code below to complete the following statements. -Heart rate can be increased by increasing _____.

The refractory period in cardiac muscle is much shorter than the refractory period in skeletal muscle to ensure that the heart can quickly be restimulated to produce alternate periods of contraction and relaxation.

Use the following answer code to compare the magnitude of the items in question. -A. stroke volume when end-diastolic volume equals 130 ml B. stroke volume when end-diastolic volume equals 160 ml

Use the answer code below to complete the following statements. -The stroke volume may be calculated by _____ minus _____.

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

Use the following answer code to compare the magnitude of the items in question. -A. normal stroke volume B. stroke volume on sympathetic stimulation

Using the following answer code, indicate which pressure relationship exists during the time in question. -during isovolumetric ventricular relaxation