You are a surgeon who is implanting a medical device in the brain of a patient with a persistent tremor in his right hand that obstructs his ability to write. Where do you implant the device that has been shown to dampen these tremors?
A. In the brainstem pathways because they control postural and most other coordinated body movements.
B. In the left somatosensory cortex because it initiates motor activity.
C. In the left corticospinal motor pathways because they control most fine, discrete muscle activity.
D. In the left corticospinal pathway or the left sensorimotor cortex that control movements of limbs on the right side of the body.
Answer: D
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Which of the following is an action of the sympathetic nervous system during stress?
A. It increases blood flow to the skeletal muscles and viscera. B. It inhibits blood clotting. C. It increases glycogen synthesis in the liver. D. It increases the ability to respond to situations where physical activity is required. E. It decreases ventilation of the lungs to save oxygen.
Match the following:
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The muscle that originates along the entire length of the linea aspera of the femur is the
A) sartorius. B) vastus medialis. C) iliacus. D) rectus femoris. E) biceps femoris.
The main activity that causes fluid to flow through lymphatic vessels is _____.
A) muscle contraction B) hydrostatic pressure C) osmotic pressure D) blood pressure