A&P2 Chapter 20

The principle that increasing the end-diastolic volume results in a corresponding increase in the stroke volume is known as...

Frank-Starling principle

the ear-like extension of the atrium is the...

auricle

The property of heart muscle to contract in the absence of neural or hormonal stimulation is called...

automaticity

A slower-than-normal heart rate is called..

bradycardia

The long plateau phase of the cardiac muscle action potential is due to..

calcium channels remaining open

the function of the atrium is to..

collect blood and then pump it to the ventricle

The structures responsible for distributing excitation to the contractile cells are...

conducting cells

If the force of ventricular contraction increases, what will happen to the end-systolic volume?

decrease

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

diastole

the structure that permits blood flow from the right atrium to the left atrium in the fetal circulation is the...

foramen ovale

Which statement correctly describes the term left atrioventricular valve?

its cusps open into the left ventricle

Which valve(s) contains 2 cusps?

left AV valve

The muscle layer of the heart is the...

myocardium

Prominent muscular ridges in the anterior atrial wall and auricles are called...

pectinate muscles

the ____ circuit carries blood to and from the lungs.

pulmonary circuit

The normal pacemaker of the heart is located in..

sinoatrial node

The ________ circuit carries blood from the aorta to the right atrium.

systemic circuit

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

systole

Beginning with the right atrium, what is the order of the valves through which blood will pass?

tricuspid valve, pulmonary semilunar valve, mitral valve, aortic valve

what is the correct order of the structural components of the conducting system of the heart?

1. SA node 2. AV node 3. AV bundle 4. Bundle branches 5. Purkinje fibers

What is the correct order for the flow of blood entering from the systemic circulation?

1. vena cavea 2. right atrium 3. right ventricle 4. pulmonary trunk 5. pulmonary veins 6. left atrium 7. left ventricle 8. aorta

Considering the left ventricle, why does isovolumetric ventricular contraction occur during ventricular systole?

Aortic pressure is higher than ventricular pressure and the ventricle must pressurize the blood to open the aortic valve.