The catecholamines norepinephrine and epinephrine are secreted by:
a. Beta cells of the islets of Langerhans
b. Basophil cells of the anterior pituitary gland
c. Chief cells of the parathyroid gland
d. Chromaffin cells of the adrenal medulla
e. Pituicytes of the posterior pituitary gland
ANS: D
The contents of chromaffin cells (catecholamines) are stained intensely brown by dichromate in fixatives, thus explaining the name of these cells.
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Glia cells that act as microbe-eating cells are the:
a. Schwann cells b. microglia c. astrocytes d. oligodendrocytes
Surfactant
A) is produced by pneumocytes type I. B) phagocytizes dust or debris. C) replaces mucus in the alveoli. D) plays a key role in keeping alveoli open. E) is not found in healthy lung tissue.
Which system of the body is responsible for elimination of wastes and regulating the volume and composition of the blood, including production of red blood cells?
a. Urinary b. Respiratory c. Digestive d. Endocrine e. Nervous
The great cardiac vein runs alongside the
A. anterior interventricular artery. B. posterior interventricular artery. C. right marginal artery. D. coronary sinus. E. aorta.