Hair is formed by the repeated divisions of epithelial stem cells in which structure?
A) hair root
B) cuticle of the hair
C) medulla of the hair
D) cortex of the hair
E) hair matrix
E) hair matrix
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Which blood vessel enters the brain through the carotid canal?
A) internal carotid artery B) external carotid artery C) common carotid artery D) internal jugular vein E) carotid sinus
The muscularis layer of the urinary bladder is commonly called the _____ muscle
A. detrusor B. trigone C. extrusor D. extrinsic
Primary active transport is accomplished by:
A. Electrical forces within the plasma membrane B. Exocytosis C. Endocytosis D. Changes in shape and position of transport proteins in the plasma membrane, requires, energy (ATP) to pump against concentration gradient
Calcium metabolism is regulated by
a. the pancreatic islets. b. the thymus. c. the parathyroid glands. d. the adrenal cortex. e. the neurohypophysis.