When parathyroid glands sense low blood Ca²⁺ levels they secrete an extracellular chemical messenger that disperses all over the body through the blood in order to trigger a series of events that move Ca²⁺ levels back towards normal. This process is an example of

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The parathyroid glands secrete a chemical messenger (parathyroid hormone) into the bloodstream, which moves throughout the whole body to target organs to increase blood calcium levels. This is an example of endocrine signaling, where a signaling molecule travels through the bloodstream to target cells throughout the body.

When Parathyroid Glands Sense Low Blood Ca2+ Levels They Secrete

When Parathyroid Glands Sense Low Blood Ca²⁺ Levels They Secrete