In cross section, a lymph vessel can be distinguished from arteries or veins because
A) the lymph vessel is usually not associated with arteries or veins, while the latter usually run together.
B) of the large number of smooth muscle fibers in the walls.
C) only the endothelial cells of the lymph vessel show nuclei.
D) the lymphatic vessels have the thinnest walls of all the vessel types.
E) the walls of the lymphatic vessels usually contract more during the sectioning and
staining process, and usually appear to be smaller than other vessels of a similar size.
D) the lymphatic vessels have the thinnest walls of all the vessel types.
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Blood flow through a capillary is controlled by a precapillary sphincter, which opens or closes due to the requirements of the cells supplied by the capillary.
Answer the following statement true (T) or false (F)
In general, parasympathetic preganglionic fibers are ________ and postganglionic fibers are ________
A) long; short B) short; long C) long; long D) short; short
A patient is in shock. He is tachycardic and hypotensive. Which of the following statements is true regarding his response to this hypoperfusion?
a. The kidneys excrete additional water b. The parasympathetic response increases c. There is a decreased in ADH production d. There is decreased cardiac output
What bone processes from the zygomatic arch?
A) The alveolar part of the zygomatic bone and the alveolar process of the temporal bone. B) The temporal process of the zygomatic bone and the zygomatic process of the temporal bone. C) The alveolar part of the zygomatic bone and the petrous part of the temporal bone. D) The zygomatic process of the zygomatic bone and the petrous part of the temporal bone. E) The lateral process of the zygomatic bone and the medial process of the temporal bone.