Repeated USMLE Questions Step 1- 378

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Q- A 30-year-old man tells you that when he carries a heavy lift, his muscle gives up all of a sudden. Which of the following actions is responsible for abrupt cessation of skeletal muscle contraction?
A- Activation of Golgi tendon organs
B- Activation of lower motor neuron
C- Activation of muscle spindles
D- Lower blood supply to the muscle

Q- Which of the following factors directly stimulates the release of antidiuretic hormone (ADH)?
A- Decreased extracellular fluid osmolality
B- Decreased temperature
C- Increased blood volume
D- Increased extracellular fluid osmolality

Q- Laboratory tests for a patient are as follows:
Plasma creatinine concentration is 0.8 mg/dL
Urine creatinine concentration is 80 mg/dL
Urine volume is 1 ml/min
Which of the following is the creatinine clearance?
A-50 ml/min
B- 100 ml/min
C- 200 ml/min
D- 300 ml/min

Answer