Category: Uncategorized

A 12-year-old child is evaluated for developmental delay. Physical examination reveals characteristic facial features, and the child is overly friendly and highly social with strangers. Cardiac examination reveals a systolic murmur, and further evaluation demonstrates supravalvular aortic stenosis. Which of the following genetic abnormalities is responsible for this child’s condition?

A 35-year-old man sustains a fracture of the midshaft of the humerus after a motorcycle accident. Several days later, he is unable to extend his wrist and fingers. Sensation is decreased over the dorsal first web space. Which nerve was most likely injured?

The fatty acid tail in biological membranes normally contributes which chemical property of the phospholipid?

A 24-year-old patient presents with a rapid onset fever, severe headache, neck stiffness, and photophobia. Meningitis is suspected, and a lumbar puncture is performed to obtain cerebrospinal fluid for analysis. The needle must enter which of the following spaces to collect the sample?

A 48-year-old man is evaluated for progressive involuntary movements and changes in behavior. His wife reports that he has become increasingly irritable and has difficulty concentrating. Physical examination demonstrates irregular, rapid, involuntary movements of the extremities. His father developed similar symptoms in his 50s. Which of the following genetic abnormalities is responsible for this patient’s condition?

A 68-year-old woman sustains a fracture through the surgical neck of the humerus. She has weakness of shoulder abduction and decreased sensation over the lateral shoulder. The artery accompanying the injured nerve is also damaged. Which of the following arteries is injured?

A 22-year-old male is brought to the emergency department after falling onto his outstretched arm during a basketball game. He has severe shoulder pain and holds his right arm slightly abducted and externally rotated. The shoulder has a flattened contour, and he is unable to move the arm normally. Radiographs confirm an anterior dislocation of the humeral head. Which nerve is most likely to be injured in this patient?

Following an increase in intracellular cAMP, activation of which of the following proteins would be observed?

A patient suffers a penetrating injury to the cubital fossa. Examination reveals loss of forearm pronation and weakened wrist flexion, but elbow flexion remains largely intact. Which nerve was most likely injured?

A fracture of the medial epicondyle injures the ulnar nerve. Which forearm action would be weakened?