The parasympathetic division of the autonomic nervous system utilizes <u>acetylcholine</u> as a postganglionic neurotransmitter.
Explanation:
The parasympathetic nervous system consists of both preganglionic (soma in the brain cell/sacral spinal cord) and postganglionic neurons (soma in the ganglion near target organ).
These neurons utilize acetylcholine as the neurotransmitter to transmit the electric nerve signals and produce parasympathetic responses like lacrimation, salivation, sexual arousal, urination and defection at the respective target organs.
Acetylcholine (Ach) can activate the receptors – muscuranic and nicotinic chloinergic receptors.
Pathway of neurotransmission: upon stimulation, ACh released by the preganglionic neuron acts on nicotinic receptors in the postganglionic neurons. Then the ACh released by the postganglionic neuron acts on the muscuranic receptors at the target organ.
<span>C.the role of the bear in the ecosystem</span>
An <span>ecosystem </span>involves both the biological (plants, animals, human beings) and non-biological (land, water, soil, and atmosphere) community which interacts as a system. More importantly, the living things are very dependent on the abiotic community since it cannot survive by itself. Every animal, plant and human needs the primary physiological needs of water, food and shelter provided by the abiotic system.
Acquired specific immunity involves the response of B and T lymphocytes (Option B).
<h3>What are B and T lymphocytes?</h3>
B and T lymphocytes are specialized cells of the immune system that trigger immune responses mediated by antibodies.
Antibodies are specific molecules that bind antigens present in pathogens in order to trigger immune responses that allow to destroy them.
In conclusion, Acquired specific immunity involves the response of B and T lymphocytes (Option B).
Learn more about B and T lymphocytes here:
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Answer:
A:1 only.
Explanation:
In order for a nuclear power plant to be decommissioned safely, components have to be taken apart and cleaned to reuse in a different location.
Answer: DNA changes in one particular gene
Explanation:
Single gene disorders are caused by DNA changes in one particular gene, and often have predictable inheritance patterns. Over 10,000 human disorders are caused by a change, known as a mutation, in a single gene. These are known as single gene disorders.