Types of mechanical obstruction found in pediatric patients include 1. volvulus 2. intussusception 3. paralytic ileus (A) 1 only (B) 1 and 2 only (C) 2 and 3 only (D) 1, 2, and 3 {Ans: (B) 1 and 2 only}During myelography, contrast medium is introduced into the (A) subdural space (B) subarachnoid space (C) epidural space (D) epidermal space {Ans: (B) subarachnoid space}Which of the following projections of the elbow will demonstrate the radial head free of ulnar superimposition? (A) AP (B) Lateral (C) Medial oblique (D) Lateral oblique {Ans: (D) Lateral oblique}A type of cancerous bone tumor occurring in children and young adults and arising from bone marrow is (A) Ewing sarcoma (B) multiple myeloma (C) enchondroma (D) osteochondroma {Ans: (A) Ewing sarcoma [Multiple myeloma is also a cancerous bone tumor usually affecting adults between ages of 40 and 70 years. Enchondroma and osteochondroma involve cartilage, they are both benign conditions.]}Which of the following factor can contribute to hypertension? 1. Obesity 2. Smoking 3. Stress (A) 1 only (B) 1 and 2 only (C) 2 and 3 only (D) 1, 2, and 3 {Ans: (D) 1, 2, and 3}What is the structure labeled number