Abeka Biology Quiz 16

What is the heart's natural pacemaker?

• Sinoatrial (SA) node
• Purkinje fibers
• Bundle of His
• Atrioventricular (AV) node

What is the muscular layer of the heart?

• Endocardium
• Epicardium
• Myocardium
• Pericardium

What is the flow of blood from the digestive organs to the liver called?

• Portal circulation

• Hepatic arterial flow
• Systemic circulation
• Pulmonary circulation

What is the contracting and pumping phase of the cardiac cycle?

• Diastole

• Systole

• Periastole

• Anastole

What is an abnormal rushing or blowing sound produced by valve damage?

• heart flutter
• valvular stenosis
• heart murmur

• cardiac arrest

What type of heart failure occurs when the heart stops beating and instead twitches randomly?

• Ventricular fibrillation
• Congestive heart failure
• Cardiac arrest
• Atrial flutter

Blood travels to the heart from the lungs through the ________ arteries?

• jugular

• pulmonary

• aortic
• coronary

The flow of blood from the heart to the rest of the body (except the lungs) is _________ circulation.

• coronary circulation
• pulmonary circulation
• systemic circulation
• renal circulation

Blood leaves the heart for the rest of the body through the body's largest artery, the _________.

• aorta
• pulmonary artery
• coronary artery
• vena cava