Electrocardiogram (EKG/ECG) Quiz

What is the purpose of an Electrocardiogram (EKG/ECG)?

• To measure blood pressure

• To assess the cardiac system

• To check body temperature

• To analyze lung function

Answer explanation

An Electrocardiogram (EKG/ECG) is specifically designed to assess the cardiac system by recording the electrical activity of the heart, helping to diagnose various heart conditions.

What are the two upper chambers of the heart called?

• Ventricles

• Atria

• SA node

• AV node

Answer explanation

The two upper chambers of the heart are called the atria. They receive blood from the body and lungs, while the ventricles are the lower chambers that pump blood out of the heart.

Where is the sinoatrial node (SA node) located?

• Left ventricle

• Right atrium

• Left atrium

• Right ventricle

Answer explanation

The sinoatrial node (SA node), known as the heart's natural pacemaker, is located in the right atrium. It initiates the electrical impulses that regulate heartbeats, making the right atrium the correct answer.

What is the function of the atrioventricular node (AV node)?

• Pumps blood to the lungs

• Conducts electrical impulses between the atria and ventricles

• Supplies oxygen to the heart muscle

• Filters blood entering the heart

Answer explanation

The atrioventricular node (AV node) is crucial for heart function as it conducts electrical impulses between the atria and ventricles, ensuring coordinated heartbeats. This makes the second answer choice correct.

What is the role of the bundle of His in the heart?

• Pumps blood to the body

• Conducts electrical impulses from the AV node to the ventricular myocardium

• Supplies nutrients to the heart

• Filters blood in the heart

Answer explanation

The bundle of His conducts electrical impulses from the AV node to the ventricular myocardium, coordinating heart contractions. This is crucial for maintaining an effective heartbeat, unlike the other options which are incorrect.

What does blood pressure reflect in the heart?

• The contraction and relaxation of the heart

• The speed of blood flow

• The temperature of the blood

• The oxygen level in the blood

Answer explanation

Blood pressure reflects the contraction and relaxation of the heart, specifically the force exerted by circulating blood on the walls of blood vessels during these phases.

During systole, what happens to the heart?

• The heart relaxes

• The heart contracts

• The heart stops

• The heart expands

Answer explanation

During systole, the heart contracts to pump blood out of the chambers. This is the active phase of the cardiac cycle, contrasting with diastole, when the heart relaxes.

What occurs during diastole?

• The heart contracts and pumps blood

• The chambers of the heart relax and fill with blood

• The heart stops beating

• The heart pumps blood to the brain

Answer explanation

During diastole, the heart chambers relax, allowing them to fill with blood. This is essential for the heart to prepare for the next contraction and pump blood effectively.

What is ischemia?

• Increased blood flow to a body part

• Decreased blood flow to a body part

• Normal blood flow to a body part

• Excessive blood flow to a body part

Answer explanation

Ischemia refers to decreased blood flow to a body part, which can lead to tissue damage due to lack of oxygen and nutrients. Therefore, the correct answer is 'Decreased blood flow to a body part'.

What is myocardial infarction?

• Increase in heart rate

• Death of myocardial cells due to prolonged ischemia

• Enlargement of the heart

• Temporary blockage of blood flow

Answer explanation

Myocardial infarction, commonly known as a heart attack, occurs when there is prolonged ischemia, leading to the death of myocardial cells. This is the correct choice, as it directly describes the condition.