The corticospinal pathways
A. bring sensory information from the spinal cord to the somatosensory region of the cerebral cortex.
B. consist of many interneurons linked synaptically.
C. begin in the cortex of the cerebellum.
D. are composed of alpha motor neurons.
E. are descending motor pathways.
Answer: E
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The posterior ramus of a typical spinal nerve innervates the
A. deep muscles of the back and the skin of the back. B. major thoracic and abdominal organs. C. abdominal wall. D. anterior and lateral trunk and the limbs. E. special senses.
Which of the following descriptions of a blood sample is most accurate?
A. The ratio of red blood cells to white blood cells would be about 1:1. B. Platelets are usually present in higher numbers than red blood cells, but lower numbers than white blood cells. C. Most of the cells that can be identified are red blood cells, with much fewer white blood cells. D. White blood cells, usually much smaller than red blood cells, are represented in much lower numbers than platelets.
During a single contraction, each myosin molecule undergoes the cycle of cross-bridge formation, movement, release, and return to its original position many times. This process is called _______.
a. excitation-contraction coupling b. cross-bridge cycling c. the power stroke d. the recovery stroke
The Golgi tendon reflex
A. helps to gain balance through a complex series of muscular contractions. B. helps to overcome pain. C. prevents muscles from contracting. D. prevents skeletal muscles from tensing excessively. E. aids in sending sensory information to the muscles.