The action potential is over before the contractile apparatus even becomes operational
a. True
b. False
Indicate whether the statement is true or false
True
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________ can be caused by alterations in receptors or by problems with G protein or second messenger pathways.
Fill in the blank(s) with the appropriate word(s).
Which of the following describes the cells of single-unit visceral muscle?
A) They contract all at once. B) They are chemically coupled to one another by gap junctions. C) They exhibit spontaneous action potentials. D) They consist of muscle fibers that are structurally independent of each other.
The hormone erythropoietin is released in the lungs.
Answer the following statement true (T) or false (F)
Place the following structures of the respiratory tree in the order in which air passes through them.
1. secondary bronchi 2. bronchioles 3. primary bronchi 4. alveoli 5. terminal bronchioles A) 4, 1, 2, 3, 5 B) 1, 3, 5, 2, 4 C) 3, 1, 2, 5, 4 D) 3, 1, 5, 2, 4 E) 1, 3, 2, 5, 4