What endocrine gland secretes melatonin?
a. hypothalamus
b. adrenal cortex
c. adrenal medulla
d. pineal gland
e. posterior pituitary gland
d
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Unipolar neurons have axons structurally divided into peripheral and central processes
Indicate whether the statement is true or false
Choose the correct description of a typical medium-sized vein.
A) In these vessels, the thin tunica media is surrounded by a thick tunica externa composed of mostly collagen fibers. B) Ranging from 2 mm to 9 mm in diameter, its thin tunica media consists of one to two layers of smooth muscle cells. C) It has a diameter of approximately 0.4 cm and has more smooth muscle cells and fewer elastic fibers. D) It ranges from 2 mm to 9 mm in diameter, and the relatively thick tunica externa has longitudinal bundles of elastic and collagen fibers. E) It has a diameter up to 2.5 cm, and its tunica media is dominated by elastic fibers rather than smooth muscle cells.
Which type of neuroglial cell functions to form the blood-brain barrier?
A. Satellite cells B. Oligodendrocyte C. Microglia D. Astrocyte
Bone cells form concentric circles around longitudinal tubes called
A) osteons. B) lacunae. C) central canals. D) canaliculi.