ANIMAL PHYSIOLOGY
CHEMICAL SIGNALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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distinct types based on the distance over which the signaling molecules act
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two distinct types based on the distance over which the signaling molecules act
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distinct types based on the signaling molecules
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none of the above
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Detailed explanation-1: -Endocrine signaling is an example of long distance communication between hormone producing cells, tissues and glands and cells that express hormone receptor molecules.
Detailed explanation-2: -There are four basic categories of chemical signaling found in multicellular organisms: paracrine signaling, autocrine signaling, endocrine signaling, and signaling by direct contact.
Detailed explanation-3: -Signals are classified into the following categories: Continuous Time and Discrete Time Signals. Deterministic and Non-deterministic Signals. Even and Odd Signals.
Detailed explanation-4: -Neuropeptides are secreted by some neurons instead of the small-molecule neurotransmitters discussed in the previous section. Some of these peptides, such as the enkephalins and endorphins, function not only as neurotransmitters at synapses but also as neurohormones that act on distant cells.