PQ 8.1 THE HEART

What are the three parts of the cardiovascular system?

• Muscles, bones, skin

• Heart, lungs, liver

• Heart, blood vessels, blood

• Brain, kidneys, stomach

What is the main function of the right side of the heart?

• Pump deoxygenated blood to the body

• Pump oxygenated blood to the lungs

• Pump deoxygenated blood to the lungs

• Pump oxygenated blood to the body

What is the outer layer of the heart called?

• Epicardium

• Pericardium

• Myocardium

• Endocardium

What are the upper chambers of the heart called?

• Valves

• Atria

• Ventricles

• Septum

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

• Prevent blood from flowing back into the ventricles

• Allow blood to flow from atria to ventricles

• Prevent blood from flowing back into the atria

• Allow blood to flow from ventricles to atria

What do the pulmonary arteries carry?

• Oxygenated blood to the lungs

• Deoxygenated blood to the body

• Deoxygenated blood to the lungs

• Oxygenated blood to the body

What is the term used to describe the ability of myocardium to contract as a single unit?

• Myofibril

• Syncytium

• Myofilament

• Sarcomere

Where is the sinoatrial node (SA node) located?

• Right atrium

• Left ventricle

• Left atrium

• Right ventricle

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

• Transmit electrical signal from ventricles to atria

• Initiate electrical signals in the atria

• Initiate electrical signals in the ventricles

• Transmit electrical signal from atria to ventricles

What is the basic rate of contraction of the heart set by?

• AV node

• SA node

• Bundle of His

• Purkinje fibres