The two vertebral arteries fuse to form a large artery called the
A) cerebral arterial circle.
B) common carotid artery.
C) external carotid artery.
D) internal carotid artery.
E) basilar artery.
E
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Glial cells differ from neurons in that they
A. are smaller and capable of mitosis. B. are larger and capable of meiosis. C. are found only in the CNS. D. transmit nerve impulses much more slowly. E. are found only in the PNS.
Refer to Table 5.1. From cells located in another part of the alien's body, you find that the protein-to-lipid ratio of the cell membrane is about 20% protein, 78% lipid, and 2% carbohydrate. Assuming the aliens use their cells as Earthlings do, and have the same terrestrial physiology, what is the most likely function of these cells?
What will be an ideal response?
The peripheral chemoreceptors that respond to oxygen levels of the blood and regulate heart activity are located in
A. the medulla oblongata. B. the right ventricle. C. the infundibulum of the hypothalamus. D. structures near the carotids and aortic arch. E. the left ventricle.
Which of the following nerves is labeled A in the diagram?
a) phrenic nerve b) ulnar nerve c) intercostal nerve d) femoral nerve e) tibial nerve