Discuss the factors that paly a role in Cardiac Output? Compare and Contrast their roles. 3. Explain the heart’s electrical and mechanical relationship (beginning with the signal from the SA-node). What role does the ANS play in cardiovascular activity? Include the corresponding text-figure references. 4. Breakdown the mechanism of Respiration in detail. Include an example using the principle of Boyle’s law. 4b. Illustrate and Explain ‘The Sliding Filament Theory of Muscle Contraction’ 5. Discuss the interrelationship between hemoglobin, oxygen, pH and the partial pressure of carbon dioxide.