What structures connect the individual heart muscle cells?
What will be an ideal response?
Intercalated discs
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The placenta allows
A. carbon dioxide and other wastes to diffuse from the maternal blood to the embryonic blood. B. oxygen and nutrients to diffuse from maternal blood to the embryo. C. maternal blood to mix with fetal blood. D. the fetus to enlarge without rupturing the mother's abdomen.
Inadequate amounts of iodine in the diet leads to an enlarged thyroid gland, known as a(n) ____
a. myxedema b. cretin c. goiter d. edema
Projection tracts
A. connect different regions within a lobe. B. link the cerebral cortex to the caudal brain regions and the spinal cord. C. connect different regions of the cerebral cortex within the same hemisphere. D. connect a region of one lobe with another lobe in the same hemisphere. E. extend between the right and left cerebral hemispheres.
Which is not a characteristic of the sympathetic nervous system?
a. intermural ganglia b. short preganglionic fibers c. unpaired ventral ganglia d. 2 nerve fibers in PNS