Cholinergic fibers use ________ as the neurotransmitter.
A. dopamine
B. serotonin
C. norepinephrine
D. acetylcholine
Answer: D
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Of the two types of synapses, based on mode of communication, which is less common but allows faster signal transmission?
A. Mechanical synapse B. Physical synapse C. Electrical synapse D. Magnetic synapse E. Chemical synapse
Ca2+ binding to tropomyosin causes myosin to change shape, physically moving it away from its blocking position
a. True b. False Indicate whether the statement is true or false
Basal stem cells in the olfactory epithelium produce new olfactory receptors every one to two months.
Answer the following statement true (T) or false (F)
What is secreted by the liver that classifies it as an excretory organ?
A. Erythropoietin B. Digestive enzymes C. Urea D. All apply.