Glossary 4.4

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P

Parathyroid Hormone

a hormone secreted by the parathyroid glands that controls calcium and phosphate levels in the blood

Pineal Gland

an endocrine gland located in or on the brain of vertebrates that secretes the hormone melatonin to regulate biological rhythms

Pituitary Gland

a two-lobed gland within the cranial cavity that produces hormones that control the other endocrine glands

Progestins

predominantly female sex hormones, including progesterone, that control the menstrual cycle

Protein Hormone

a hormone composed of chains of amino acids that is water soluble; usually acts on cell membrane receptors