Answer:
a) parasympathetic innervation
Explanation:
The parasympathetic system is characterized by having Acetilcoline(Ach) as neurotransmitter. It receptors are whether nicotinic receptors or muscarinic receptors.
When acetilcoline interacts with a muscarinic receptor in the nasopharingeal glands lead to secretion of mucus.
Cell, Tissue, Organ, Organ System
(Hope this Helps)
Answer:
metamorphic-existing rocks are exposed to extreme conditions
sedimentary rock-layers of sediment dry together
igneous rock-magma or lava cools and solidifies.
Explanation:
alleles
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