Q. A 23-year-old man is brought to the emergency department due to a traffic accident. On arrival, the patient is conscious, with multiple bruises over the face and limbs. There is an open fracture of the femur with active bleeding. Vital signs show hypotension (BP of 78/50 mmHg) and tachycardia (HR is 105 bpm). He has multiple bruises over the anterior chest with no point tenderness. Which of the following cardiac chambers is most likely injured in this patient?