Ch20 Pearson

Increased pressure in the ventricles would close what valve(s)?

AV valves only

Which of the following statements is true about the SA (sinoatrial) node? A. It is embedded in the posterior wall of the right atrium. B. The pacemaker cells, which establish the heart rate, are located in the SA node. C. The rate of spontaneous depolarization of SA nodal cells is the fastest in the SA node. D. All of these statements about the SA node are true.

D. All of the statements about the SA node are true

The P wave of the electrocardiogram is closely followed by

contraction of both atria

The P wave of the electrocardiogram is a signal from

depolarization of the atria

The amount of blood remaining in the ventricle when the semilunar valve closes is the...

end systolic volume

When the semilunar valves close, the AV valves then

open

Cells that spontaneously make action potentials make up __________ tissue

pacemaker

The papillary muscles function to...

prevent the AV valves from reversing into the atria

Contractions of the papillary muscles

prevent the atrioventricular valves from reversing into the atria

The right ventricle pumps blood to the...

right and left lungs

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

stroke volume

The contraction phase of the cardiac cycle is called...

systole

The heart is actually _____________ pump(s)

two

The amount of blood returning to the heart is the

venous return

Isovolumetric relaxation and ventricular filling (two phases of the cardiac cycle) take place during...

ventricular diastole

The T wave on the ECG tracing represents...

ventricular repolarization

In a procedure known as ______________________ , an inflatable balloon at the end of a catheter is used to press plaque back against the vessel wall.

Balloon angioplasty

When a blood clot forms on a ruptured plaque in a coronary artery, the condition is referred to as a(n)...

Coronary thrombosis

Intercalated discs serve to transfer ______________ from cell to cell A. ionic currents B. action potentials C. electrical signals D. the force of contraction E. All of the answers are correct.

E. All of the answers are correct

Stroke volume depends on... A. the pressure required to pump blood into the aorta. B. the contractility of the ventricle. C. venous return of blood to the heart. D. end-diastolic volume. E. All of the answers are correct.

E. All of the answers are correct

Cardiac muscle cells and skeletal muscle cells differ in a few ways. Which of the following is NOT one of them? A. Cardiac muscle cells have a single, centered nucleus. B. Cardiac muscle cells are smaller in size. C. Cardiac muscle cells branch. D. Skeletal muscle cells lack intercalated discs. E Cardiac muscle cells lack transverse tubules.

E. Cardiac muscle cells lack transverse tubules

What causes the aortic semilunar valve to close?

Greater pressure in the aorta than in the left ventrical

Put the phases of the cardiac cycle in the correct order, starting after ventricular filling

Isovolumetric contraction, ventricular ejection, isovolumetic relaxation

Which heart chamber receives blood from the pulmonary veins?

Left atrium

Which chamber pumps oxygenated blood out of the aorta to the systemic circuit?

Left ventricle

Which of the following is correct about the filling of the ventricles? A. Most blood flows passively into the ventricles through open AV valves. B. The majority of ventricular filling is caused by contraction of the atria.

Most blood flows passively into the ventricles through open AV valves

Describe the pressures in the atria and ventricles that would cause the opening of the AV valves.

Pressure in the atria would be greater than the pressure in the ventricles

Oxygen is added to blood as it flows through the ___________________ circuit.

Pulmonary

Depolarization of the ventricles is represented on an electrocardiogram by the

QRS complex

Which chamber receives blood from the superior and inferior vena cavae?

Right atrium

What heart chamber pumps unoxygenated blood out of the pulmonary trunk?

Right ventricle

"An increase in end-diastolic volume increases the stroke volume" is a way of stating _________________ laws of the heart.

Starling's

The left ventricle pumps blood to the

aorta

The inferior part of the heart is called

apex

The ______________ carry blood away from the heart.

arteries

The bicuspid or mitral valve is located...

between the left atrium and left ventricle

A slower than normal heart rate is called...

bradycardia

The function of an atrium is to...

collect blood then pump it to the ventricle