Physical connections of the medulla include
A) all fibers connecting the brain to the spinal cord.
B) ascending tracts, but not descending tracts, from the brain.
C) descending tracts, but not ascending tracts, to the brain.
D) direct links between the spinal cord and cerebellarl hemispheres.
E) All of the answers are correct.
A) all fibers connecting the brain to the spinal cord.
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Which of the following would not be considered a mutagen?
A. Ethidium bromide, a chemical that binds directly to DNA and deforms the double helix B. Flavonoids, a family of compounds which can remove free radicals from cells C. X-rays, which can break the bonds in DNA molecules D. Nitrous acid, which can convert cytosine to uracil
The central nervous system (CNS) consists of
A) spinal and cranial nerves. B) the cerebrum and cerebellum. C) the brain and spinal cord. D) nerves in the upper and lower limbs.
The abducens nerves
A. transmit pain impulses from the teeth. B. are involved in eye movement. C. dilate blood vessels in the skin. D. slow the heart rate. E. control size of the pupil.
Damage to the ventral roots of the first five thoracic spinal nerves on the right side of the body would interfere with the ability to
A) dilate the right pupil. B) constrict the right pupil. C) dilate the left pupil. D) constrict the left pupil. E) smile and frown.