The passageway through the digestive tube is called the ________.
Fill in the blank(s) with the appropriate word(s).
lumen
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The groove separating the greater and lesser tubercles of the humerus is the ____________________ groove.
Fill in the blank(s) with the appropriate word(s).
A G protein is
A. a type of water-soluble hormone. B. a second messenger activated by a steroid hormone. C. a molecule that binds a guanine nucleotide and helps transduce a signal inside a target cell. D. a receptor for a water-soluble hormone that causes arachidonic acid to be extracted from a phospholipid. E. an enzyme that catalyzes the conversion of ATP into cyclic AMP.
Shortly after birth, the foramen ovale of the fetal heart ceases to function as an open pathway for blood
Indicate whether this statement is true or false.
Immediately following the arrival of a stimulus at the skeletal muscle cell there is a short period called the ________ period
A) relaxation B) contraction C) latent D) refractory