WBR0762
| Author | [[PageAuthor::Rim Halaby, M.D. [1]]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Physiology |
| Sub Category | SubCategory::Musculoskeletal/Rheumatology |
| Prompt | [[Prompt::A researcher is analyzing muscle biopsy sections from 10 volunteers. In his experiment, he biopsies 20 mg of muscles from different regions of the body using a special needle technique. Then he types muscle fibers according to myofibrillar ATPase histochemistry and calculates the percentage of type I and type II fibers. Finally,vapor fixation and quantitative histochemical techniques were used and compared to blocks of myoglobin for calibration. The researcher concludes that myogbolin concentration varies significantly between different muscle samples. Biopsy of which of the following muscles most likely has the least myoglobin concentration?]] |
| Answer A | AnswerA::Biceps brachii muscle |
| Answer A Explanation | AnswerAExp:: |
| Answer B | AnswerB::Deltoid muscle |
| Answer B Explanation | AnswerBExp:: |
| Answer C | AnswerC::Vastus lateralis muscle |
| Answer C Explanation | AnswerCExp:: |
| Answer D | AnswerD::Soleus muscle |
| Answer D Explanation | AnswerDExp:: |
| Answer E | AnswerE::Triceps muscle |
| Answer E Explanation | AnswerEExp:: |
| Right Answer | RightAnswer:: |
| Explanation | [[Explanation::Reference:
Bekedam MA, van Beek-Harmsen BJ, van Mechelen W, et al. Myoglobin concentration in skeletal muscle fibers of chronic heart failure patients. J App Physiol (1985). 2009; 107(4):1138-43. |
| Approved | Approved::No |
| Keyword | |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |