Final answer:
Parathyroid hormone secretion is primarily regulated through humoral stimuli by monitoring blood calcium levels.
Explanation:
Humoral stimuli refers to the control of hormonal release in response to changes in extracellular fluids such as blood or the ion concentration in the blood. Parathyroid hormone secretion is regulated primarily through humoral stimuli, which involves the monitoring of blood calcium levels to determine whether more parathyroid hormone should be released.
Neural stimuli and hormonal stimuli are the other mechanisms for hormonal release, but in the case of parathyroid hormone, humoral stimuli is the key regulator.
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