________ is a process by which an extracellular signal molecule, called the ________, activates a membrane receptor that in turn alters intracellular molecules, called the ________, to create a response.
Fill in the blank(s) with the appropriate word(s).
Signal transduction, first messenger, second messenger
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Cilia are found
A) mostly in muscle cells. B) on the inside of cell membranes. C) in large numbers on cells that secrete hormones. D) in cells that are required to move fluids or secretions along the cell surface. E) only on cells lining the reproductive tract.
What type of muscle assists an agonist by causing a like movement or by stabilizing a joint over which an agonist acts?
A) a prime mover B) an agonist C) a synergist D) an antagonist
The ________ can be calculated by multiplying breathing rate by tidal volume.
A. inspiratory reserve volume B. inspiratory capacity C. minute respiratory volume D. anatomic dead space E. alveolar ventilation rate
Dendritic cells serve as antigen-presenting cells.
Answer the following statement true (T) or false (F)