Exam 9: Cardiac Physiology

If the EDV were held constant, increased cardiac output could be accomplished by

Use this figure to answer the corresponding questions. -Which structures are closed during ventricular ejection? a.1 and 2 b.1 and 3 c.2 and 4 d.1, 2, 3, and 4 e.only 3 and 4

Cardiac output is equal to (EDV-ESV) times the number of heart beats per minute

During isovolumetric contraction,

Match heart characteristic with correct anatomical structure. a.tricuspid valve b.myocardium c.aortic semilunar valve d.AV node e.sinoatrial node -This electrically connects the atria to the ventricles

Match EKG feature with the correct characteristic. a.P wave b.QRS complex c.T wave d.PR interval e.TP interval f.ST segment -Time during which impulse is traveling through the AV node

Describe how contractile cells are able to contract rapidly but are not likely to experience tetanus.Include the following terms in your answer: refractory period, calcium channels, contraction period, relaxation period, depolarization, and repolarization.

The AV nodal delay ensures that:

An stationary embolus in a pulmonary artery could break loose and travel as a thrombus where it could stop up a smaller blood vessel in the lung.

The pulmonary circulation carries oxygenated blood from the lungs through the coronary circulation and then into the aorta.

Use the following answer code to compare the magnitude of the items in question. a.A is greater than b.b.B is greater than a.c.A and B are equal or nearly equal. -a.Duration of the refractory period in cardiac muscle B.Duration of contraction in cardiac muscle

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

Indicate which ion is involved in each event being described by using the following answer code. a.K+ b.Na+ c.Ca₂₊ -Slow inward diffusion of _____ is largely responsible for the plateau portion of the cardiac action potential.

Blood returning from the lungs

Fibrillation is the

During isovolumetric phases of the cardiac cycle,

Use the following answer code to compare the magnitude of the items in question. a.A is greater than b.b.B is greater than a.c.A and B are equal or nearly equal. -a.Velocity of impulse through the bundle of His and Purkinje system B.Velocity of impulse conduction through the AV node

Use the answer code below to complete the following statements. a.stroke volume b.end-diastolic volume c.cardiac output d.heart rate e.end-systolic volume f.sympathetic activity g.stroke volume and heart rate h.end-diastolic volume and end-systolic volume i.end-diastolic volume and sympathetic activity -The maximum volume of blood that the ventricle contains after filling is complete is the _____.

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code: a.caused by sympathetic stimulation b.caused by parasympathetic stimulation c.not brought about by sympathetic or parasympathetic stimulation -Increases the AV nodal delay

The right half of the heart pumps blood through the ____ circuit and the left half pumps blood through the ____ circuit.