Smooth muscle is characterized by all of the following except ________.
A) it appears to lack troponin
B) there are more thick filaments than thin filaments
C) there are no sarcomeres
D) there are noncontractile intermediate filaments that attach to dense bodies within the cell
B) there are more thick filaments than thin filaments
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Many autonomic fibers release ____________________ along with the classical neurotransmitters
Fill in the blank(s) with correct word
During inspiration,
a. intra-alveolar pressure falls below atmospheric pressure. b. the diaphragm contracts. c. the internal intercostal muscles contract. d. conditions a and b exist e. conditions a, b, and c exist
During the swallowing reflex __________.
a) the epiglottis closes off the glottis b) breathing rate increases c) the esophageal sphincter closes off the esophagus d) the tongue closes off the pharynx
The cell body of a neuron does all of the following except
a. release neurotransmitter into the synaptic cleft. b. produce synaptic vesicles containing neurotransmitter that are subsequently transported to the synaptic knob. c. conduct graded potentials to the initial segment. d. receive graded potentials from dendrites.