Which Phase of the Cardiac Cycle Is Responsible for Ventricular Relaxation and Filling with Blood

Mr. Santos, a 55-year-old Male, Is Admitted to the Hospital with Complaints of Chest Pain and Shortness of Breath. He Has a History of Hypertension and Smoking. Upon Assessment, the Nurse Notes Elevated Blood Pressure, Tachycardia and Crackles in the Lungs