D. Geographic separation of a population
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Diffusion is a process in which particles of two or more substances intermixed with each other.
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Answer:
receptor binding
Explanation:
Hormones are able to act specifically on target cells through receptor binding. This process enables target cells to react to a specific hormone only. The cells have hormone receptors within or on their surface which permits the specific hormone to act on it, thereby initiating a series of functions of the particular cell that has the hormone receptor. For example, thyroid receptors respond to thyroid-stimulating hormone.
Answer:
Sympathetic
Explanation:
Preganglionic motor neurons are a part of the autonomic nervous system - a part of the nervous system that acts mostly involuntarily and regulates bodily functions, such as the heart rate, breathing, digestion, etc.
A preganglionic motor neuron is a type of motor neuron, the cell body of which is located in the brain or spinal cord, while its axon leaves the central nervous system as part of a cranial or spinal nerve before separating and entering the autonomic ganglion.
The preganglionic neurons that originate in the thoracic and lumbar regions of the spinal cord are the sympathetic preganglionic neurons.
