Heart Function Quiz

What stimulates contractions in the heart?

• Chemical signals

• Electrical impulses

• Mechanical pressure

• Thermal energy

What are the two main phases of the heart cycle?

• Expand and contract

• Fill and empty

• Contract and push, Relax and fill

• Open and close

Diagram of the heart showing blood flow directions

• Blood flows from the right atrium to the right ventricle

• Blood flows from the left atrium to the left ventricle

• Blood flows from the left ventricle to the right atrium

• Blood flows from the right ventricle to the left atrium

What are the two phases of the cardiac cycle?

• Systole and Diastole

• Contraction and Relaxation

• Inhalation and Exhalation

• Expansion and Contraction

Which node is responsible for initiating the heartbeat?

• Atrioventricular node

• Sinoatrial node

• Bundle of His

• Purkinje fibers

Which of the following is NOT a tissue that transmits electrical impulses in the heart?

• Sinoatrial node

• Atrioventricular node

• Bundle of His

• Alveoli

What is the first structure in the path of electrical impulses in the heart?

• Atrioventricular node

• Sinoatrial node

• Bundle of His

• Purkinje fibers

Which structure follows the atrioventricular node in the path of electrical impulses?

• Sinoatrial node

• Atria

• Bundle of His

• Purkinje fibers

What is the role of Purkinje fibers in the heart?

• Initiate the heartbeat

• Conduct impulses to the ventricles

• Connect the atria and ventricles

• Slow down the heart rate

What does the ECG cycle represent in the human body?

• Electrical activity of the heart

• Blood pressure levels

• Oxygen levels in the blood

• Heart muscle contractions