The smooth muscle cells of the digestive tract need to send electrical signals between each other to contract in unison. The type of intercellular junction best suited for this need is ________.
A. a desmosome
B. found in the blood-brain barrier
C. a tight junction
D. a gap junction
Answer: D
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A person warming up after being cold feels a warm rush as blood flows quickly to the peripheral appendages. Nitric oxide is important in this situation because it
A. raises blood temperature. B. raises blood pressure. C. relaxes the smooth muscle in the blood vessel wall. D. enhances gas exchange.
An intercalated disc is an example location of ________.
A. hemidesmosome B. goblet cells C. an adhesion belt D. gap junctions E. a striation
Stimulation of the Golgi tendon organs result in which of the following changes in the reflex arc?
A. Both "stimulation of an inhibitory neuron" and "decreased action potentials in alpha motor neurons" are correct. B. Contraction of skeletal muscle fibers C. Stimulation of an inhibitory neuron D. Decreased action potentials in alpha motor neurons E. Stimulation of a stimulatory interneuron
Which of the following is NOT consistent with active transport?
A. uses cell energy B. movement is against a concentration gradient C. movement is with a concentration gradient D. exhibits competition and saturation E. involves a carrier