A 33-year- old man complains of severe pain & swelling of his right shoulder following falling from a height. Radiologic examination shows torn rotator cuff tendons.

Which muscle tendon is most probably intact and has normal function in this case ?

A 72-year-old patient presents with reduced range of motion in the vertebral column due to advanced osteoarthritis. Imaging shows narrowing of intervertebral joint spaces.

Which type of joint is primarily affected in this patient?

A 22-year-old male medical student participates in a 10 km run. He has been training regularly for the past 3 months. During the run, his body efficiently produces ATP to sustain muscle contraction.

Which specific metabolite is the primary fuel source used by skeletal muscle during prolonged moderate-intensity aerobic exercise such as this run?

A 6-year-old girl is brought to the pediatrician by her parents due to concerns about her frequent falls and fractures. Radiographic imaging reveals thin and deformed long bones. Her past medical history includes multiple hospitalizations for fractures

Which most accurately explains the structural defect in the collagen of this patient?

1.   Collagen helices contain multiple triplet repeats of Gly- X- Y, where X is often Proline.

Which single amino acid is usually Y?