Immediate interventions (O₂, medications, CPR)
Act as a communication bridge: patient ↔ family ↔ EMS
Provide emotional support during emergencies
Critical role in survival and outcomes until advanced care arrives
Four chambers:
Right atrium
Right ventricle
Left atrium
Left ventricle
Valves ensure one-way blood flow
– Tricuspid
– Pulmonary
– Mitral
– Aortic
Major vessels:
Superior & inferior vena cava
Pulmonary artery & veins
Aorta
Left side = pumps oxygenated blood to the body
Right side = pumps deoxygenated blood to lungs
