Which of these processes can cause a local potential?
A) changes in membrane permeability
B) ligands binding to their receptors
C) mechanical stimulation
D) changes in the charge across the plasma membrane
E) all of these
Ans: E) all of these
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Because of the active transport of Na+ and K+, the intracellular concentration of Na+ is lower than the extracellular concentration, whereas the reverse is true for K+.
Answer the following statement true (T) or false (F)
What do alpha cells of the pancreas secrete?
A. Somatostatin B. Insulin C. Pancreatic polypeptide D. Glucagon E. Gastrin
ATP is a nucleotide that is composed of
A. adenosine, deoxyribose, and three phosphorous atoms. B. arginine, thymidine and three phosphorous atoms. C. adenine, thymine, and three covalently bonded phosphate groups. D. adenine, ribose, and three covalently bonded phosphate groups. E. adipose, thymine, and three phosphate groups linked by ionic bonds.
The skin consists of a superficial ________ and a underlying ________.
A. dermis; epidermis B. epidermis; dermis C. epidermis; hypodermis D. dermis; hypodermis