Intro III: Endocrine Packet 1

Endocrine System

A specialized communication network of glands that secrete hormones directly into the bloodstream to coordinate bodily functions.

Endocrine Glands

Ductless glands that release hormones directly into the circulatory system to reach distant target organs.

Exocrine Glands

Glands that release products, such as digestive enzymes, locally through ducts.

Hormones

Chemical messengers that travel via the bloodstream to regulate various bodily functions and target specific organs.

Negative Feedback Loops

The primary control mechanism maintaining endocrine balance, where low hormone levels stimulate the release of more hormones until balance is restored.

Hypothalamus

Brain structure linking the endocrine system to the nervous system; directs the pituitary gland to regulate hormone release.

Pituitary Gland

Known as the 'Master Gland', it interprets signals from the brain and coordinates hormone secretion across multiple peripheral glands.

Growth Hormone (GH)

Stimulates cell division, bone growth, and cartilage formation.

Oxytocin

Facilitates milk ejection during breastfeeding and emotional bonding.

Adrenocorticotropic Hormone (ACTH)

Stimulates hormone production in the adrenal cortex.

Calcitonin

A hormone produced by thyroid C-cells that promotes calcium deposition into bone tissue.

Parathyroid Hormone (PTH)

Regulates calcium and phosphorus balance in the body.

Cushing's Syndrome

A condition marked by excessive cortisol levels, leading to symptoms like central weight gain and muscle weakness.

Acromegaly

A condition due to excessive growth hormone, causing enlargement of bones in hands, feet, and face.

Hyperthyroidism

A condition caused by excessive thyroid hormone production, leading to increased metabolic activity and symptoms like weight loss and anxiety.

Hypothyroidism

A condition characterized by inadequate thyroid hormone production, resulting in metabolic slowing.

Polyendocrine Metabolic Ovarian Syndrome (PCOS)

A condition in females marked by elevated androgen levels, resulting in irregular cycles and other symptoms.

Aging

A process that leads to gradual changes in endocrine efficiency, increasing the risk of endocrine-related health issues.

Premature Ovarian Failure

Early cessation of ovarian estrogen synthesis before age 40 due to various factors.

Thymus

A gland producing T lymphocytes essential for immune system development that shrinks significantly by adulthood.

Adrenal Cortex

Part of the adrenal glands that synthesizes corticosteroids involved in electrolyte and fluid balance.

Estrogen

A hormone that governs puberty, secondary sex characteristics, and menstrual cycle regulation.

Testosterone

A hormone that drives male puberty and influences masculine characteristics.