Understanding Heart Function and Regulation

What is the main function of the left ventricle in the heart?

• To pump oxygenated blood to the lungs

• To pump deoxygenated blood to the body

• To pump oxygenated blood to the body

• To receive deoxygenated blood from the body

Which part of the heart is responsible for initiating the heartbeat?

• Atrioventricular node

• Sinoatrial node

• Bundle of His

• Purkinje fibres

What is the role of baroreceptors in the body?

• Detect changes in blood pressure

• Detect changes in blood pH

• Detect changes in blood glucose levels

• Detect changes in body temperature

Which of the following is a function of the sympathetic nervous system?

• Decrease heart rate

• Increase digestion

• Increase heart rate

• Constrict pupils

What effect does the parasympathetic nervous system have on the heart?

• Increases heart rate

• Decreases heart rate

• No effect on heart rate

• Increases blood pressure

Which structure in the heart acts as an electrical relay station, slowing the electrical current before it passes to the ventricles?

• Sinoatrial node

• Atrioventricular node

• Bundle of His

• Purkinje fibres

What is the primary role of chemoreceptors in the body?

• Detect changes in blood pressure

• Detect changes in blood pH and carbon dioxide levels

• Detect changes in blood glucose levels

• Detect changes in body temperature

Which of the following best describes the function of the Bundle of His?

• Initiates the heartbeat

• Transmits impulses from the atrioventricular node to the ventricles

• Slows down the electrical impulse

• Distributes the impulse throughout the ventricles

What is the effect of adrenaline on the heart?

• Decreases heart rate

• Increases heart rate

• No effect on heart rate

• Decreases blood pressure

Which of the following is NOT a component of the heart's conduction system?

• Sinoatrial node

• Atrioventricular node

• Bicuspid valve

• Purkinje fibres