Half of the fibers of each optic nerve decussate at the ________
A) lateral geniculate nucleus of the thalamus
B) optic foramen
C) optic chiasm
D) superior colliculus
E) midbrain
C
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The nerves going to the upper limbs join the spinal cord at the ________ region
A) Lumbar B) Thoracic C) Sacral D) Cervical
The life characteristic of reproduction may be interpreted at both the cellular and organismal levels
Indicate whether this statement is true or false.
Twitch summation
a. is a means by which gradation of muscle contraction may be accomplished. b. results from increasing the number of motor units that are firing within a muscle. c. results from increasing the frequency at which motor units are firing within a muscle. d. both (a) and (b) above. e. both (a) and (c) above.
In connective tissue, the extracellular matrix consists of
A. cells and ground substance. B. cells and protein fibers. C. protein fibers and ground substance. D. ground substance only. E. ground substance and intracellular fluid.