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Answer :
Final answer:
The nervous system releases neurotransmitters directly onto target tissues.
Explanation:
The nervous system releases neurotransmitters directly onto target tissues.
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Final answer:
Option a is the correct answer. The system that releases neurotransmitters directly onto target tissues is the Nervous system. Neurotransmitters like acetylcholine and norepinephrine are released by neurons at synapses, affecting the target cells immediately. Hormones, on the other hand, are released into the bloodstream by the Endocrine system.
Explanation:
The system(s) that release neurotransmitters directly onto target tissues is the Nervous system. Neurotransmitters are signaling molecules that are released at synapses by neurons and they act directly on the target cells. An example of a neurotransmitter would be acetylcholine, which is released by axons at cholinergic synapses, directly affecting the target tissue. Meanwhile, the adrenergic system involves postganglionic sympathetic fibers releasing norepinephrine, which also acts as a neurotransmitter when it directly interacts with an effector such as a muscle or gland. However, when epinephrine or norepinephrine is released into circulation by the adrenal medulla, it is considered a hormone, as it is released into the bloodstream and affects distant target cells. This clarifies that the Nervous system is the correct option that releases neurotransmitters directly onto target tissues, while hormones are released into the bloodstream by the Endocrine system.
