Cardiac Cycle and Heart Abnormalities Quiz

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What is the main purpose of the atrial systole phase of the cardiac cycle?

To pump 30% of the blood into the ventricles (correct)

To increase the pressure in the ventricles

To increase the duration of the cardiac cycle

To generate the P-wave in the ECG

How does an increase in heart rate (tachycardia) affect the duration of the cardiac cycle?

The duration of diastole decreases while systole remains unchanged (correct)

The duration of systole increases while diastole decreases

The duration of both systole and diastole decrease

The duration of systole and diastole both increase

What is the typical duration of the ventricular systole phase of the cardiac cycle?

0.7 seconds

0.3 seconds (correct)

0.5 seconds

0.1 seconds

Which of the following events occurs during the cardiac cycle?

Recording of pressure changes in the atria and ventricles Signup and view all the answers

What is the relationship between atrial and ventricular systole during the cardiac cycle?

Atrial systole occurs before ventricular systole Signup and view all the answers

What is the typical duration of the entire cardiac cycle if the heart rate is 75 beats per minute?

0.8 seconds Signup and view all the answers

What is the purpose of the pulmonary capillaries mentioned in the text?

To distribute the blood to the lungs for oxygenation Signup and view all the answers

What is the function of the mitral (left A.V.) valve mentioned in the text?

To allow the left atrium to pump blood to the left ventricle Signup and view all the answers

What is the role of the fibrous skeleton of the heart described in the text?

It contains the four rings forming the openings of the heart valves Signup and view all the answers

What is the significance of the intercalated discs mentioned in the text?

They allow the cardiac muscle fibers to act as a functional syncytium Signup and view all the answers

How are the cardiac muscle fibers described in the text?

They are striated and involuntary in function Signup and view all the answers

What is the arrangement of the cardiac muscle fibers described in the text?

They are arranged in a branched network Signup and view all the answers

What is the cardiac property that refers to the ability of cardiac muscle fibers to respond to a stimulus of adequate strength and duration?

Excitability Signup and view all the answers

During which phase of the cardiac muscle action potential does rapid depolarization occur?

Phase 0 Signup and view all the answers

What is the resting membrane potential range of atrial and ventricular muscles?

-80 to -100 mv Signup and view all the answers

Which mechanism contributes to maintaining the resting membrane potential in cardiac muscle?

Sodium-potassium pump mechanism Signup and view all the answers

What phase of the cardiac muscle action potential represents a small rapid repolarization due to potassium outflow and chloride inflow?

Phase 1 Signup and view all the answers

Which cardiac property relates to the ability of impulses to conduct through the heart tissue?

Conductivity Signup and view all the answers