Cardiac Pump OBJECTIVES Describe how the heart enable it to pump blood through the systemic and pulmonary circulations. Discuss the pressure changes in the heart chambers and great vessels during a complete cardiac cycle. List the factors that determine cardiac contractile force Explain how electrical excitation of the heart is coupled to its contractions• Discuss the pressure changes in the heart chambers and great vessels during a complete cardiac cycle. Cardiac Pump OBJECTIVES • Describe how the heart enable it to pump blood through the systemic and pulmonary circulations. • Explain how electrical excitation of the heart is coupled to its contractions. • List the factors that determine cardiac contractile force