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A point lying inside (under) a production possibilities frontier indicates that
Hypothalamus
Part of the vertebrate brain; in mammals it regulates the pituitary gland, the autonomic system, emotional responses, body temperature, water balance, and appetite; located below the thalamus.
Sensory Nerve Cells
Nerve cells that are responsible for converting external stimuli from the organism's environment into internal electrical impulses.
Sweat Glands
Specialized glands in the skin that produce sweat, a fluid containing water and salts, which helps regulate body temperature.
Skeletal Muscles
Muscles attached to the skeleton that are responsible for movement and are under voluntary control.
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