Cholinergic fibers use ________ as the neurotransmitter.
A. dopamine
B. serotonin
C. norepinephrine
D. acetylcholine
Answer: D
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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
What is secreted by the liver that classifies it as an excretory organ?
A. Erythropoietin B. Digestive enzymes C. Urea D. All apply.
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
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)