Which of the following statements about the respiratory centre is/are incorrect?

(1) The respiratory centre is located in the cerebral cortex.

(2) The respiratory centre receives sensory information from chemoreceptors.

(3) The respiratory centre passes motor information to the respiratory muscles.

Which of the following statements about the initiation of heartbeat are incorrect?

(1) The initiation of heartbeat is myogenic.

(2) Both the SA node and the AV node generate electrical impulses to initiate heartbeat.

(3) The initiation of heartbeat is unaffected by the nervous system.

Which of the comparisons between SA node and AV node is incorrect?

Which of the comparisons between atrial systole and ventricular systole is correct?

Which of the following statements about diastole in the cardiac cycle are correct?

(1) Diastole is the longest phase in the cardiac cycle.

(2) Heart sound is produced during diastole.

(3) Blood flows from atria to ventricles during diastole.

The graph shows the pressure changes in the left ventricle, aorta and left atrium during a cardiac cycle.

What are the conditions of the semilunar valves and atrioventricular valves at P, Q, R and S?

Which of the following statements about hormonal control of the cardiac output are correct?

(1) Adrenaline is a hormone which stimulates the SA node and cardiac muscle.

(2) Adrenal gland increases its secretion of adrenaline upon stimulation from the sympathetic nerve.

(3) Adrenaline increases the cardiac output by increasing the heart rate and stroke volume.

9. Which of the following contribute to the increase in total cardiac output during exercise?

(1) vasodilation of blood vessels in the skin

(2) increase in stroke volume

(3) increase in heart rate

During exercise, which of the following changes will occur?

(1) The respiratory centre is stimulated to increase the depth of breathing.

(2) The cardiovascular centre is stimulated to reduce the cardiac output.

(3) Adrenal glands are stimulated to secrete more adrenaline.