A cell is not stimulated but It does contain an electrical charge difference across its membrane. This charge difference is its __________.
Fill in the blank(s) with the appropriate word(s).
resting membrane potential
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Which has the greater concentration of hydrogen ions, a substance with a pH of 5 or a substance with a pH of 4?
A) A pH of 4 is greater. B) A pH of 5 is greater. C) They are both equal; 4 and 5 are relative values. D) pH 9, if you mixed the solutions. E) There is not enough information to determine the answer.
Red blood cells contain the enzyme _____, which catalyzes the formation of carbonic acid.
A. carbonic anhydrase B. carbon dioxide acidase C. oxidase D. catalase
During implantation, the
A) syncytial trophoblast erodes a path through the endometrium. B) inner cell mass begins to form the placenta. C) maternal blood vessels in the endometrium are walled off from the blastocyst. D) entire trophoblast becomes syncytial. E) inner cell mass is temporarily deprived of nutrients.
The hypodermis is characterized by an abundance of which tissue?
A. Dense irregular connective tissue B. Smooth muscle C. Nervous tissue D. Adipose tissue E. Stratified squamous epithelium