1) The abductor pollicis brevis moves the: (a) lower leg (b) lower arm (c) thumb

Question

1) The abductor pollicis brevis moves the: (a) lower leg (b) lower arm (c) thumb (d) hand

2) When you stimulate the sensory nerve with the stimulating electrodes, the signal has to travel to the brain before it can cause the muscles to move: (a) True (b) False

3) A motor unit is: (a) all of the muscle fibers inervated by a motor neuron (b) 2 or more motor neurons that control a single muscle fiber (c) does not have an all or none response (d) is the same as a sensory nerve

4) The patellar reflex is fast because the entire nerve pathway for the response is located within the quadriceps muscle: (a) True (b) False

5) The triceps extends the lower arm: (a) True (b) False

6) Reflexes can't be influenced by muscle contractions in other parts of the body: (a) True (b) False

7) The absence of the patellar reflex may be a sign of: (a) a herniated lumbar disk (b) multiple sclerosis (c) spinal cord injury (d) depression

Explanation / Answer

1) The abductor pollicis brevis moves along the thumb. Hence, option c is right.

2) The M1 cortex in the brain is involved in motor function. The motor cortex first generates nerve impulses and sends it to the sensory nerve. The sensory nerve sends impulses to the brain, which then send signals to the muscle for movement. Hence, the statement is true (option a).

3) A motor unit is composed muscle fibers innervated by a motor neuron. Hence, right option is a.

4) The right option is ‘a’, since the patellar reflex is located within the quadriceps muscle.

5) The option is ‘b’ as the triceps extends the upper arm.

6) Reflexes from the body are influenced by muscle contraction in other parts of the body. Eye movement will allow the body to either move forward or backward utilizing the arm or thigh muscles. Hence, right answer is ‘b’.

7) The bipolar sensory synapses from patellar reflex via the quadriceps, directly to the spinal cord. Hence, the right option is ‘c’.

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