What endocrine gland secretes melatonin?
a. hypothalamus
b. adrenal cortex
c. adrenal medulla
d. pineal gland
e. posterior pituitary gland
d
You might also like to view...
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.
Bone cells form concentric circles around longitudinal tubes called
A) osteons. B) lacunae. C) central canals. D) canaliculi.
Which type of neuroglial cell functions to form the blood-brain barrier?
A. Satellite cells B. Oligodendrocyte C. Microglia D. Astrocyte