Comprehensive Study Guide for the Endocrine System

Hypothalamus

The control center of the endocrine system located in the brain.

Pituitary Gland

Often called the 'master gland', located below the hypothalamus and regulates other endocrine glands.

Pineal Gland

Endocrine gland located in the brain that secretes melatonin.

Thyroid Gland

Vascular organ in the neck with two lobes flanking the trachea; regulates metabolism.

Parathyroid Glands

Embedded within the thyroid gland; secrete parathyroid hormone (PTH) to regulate calcium levels.

Thymus

Located in the upper chest; plays a role in immunity and T-cell development.

Pancreas

Involved in glucose regulation through insulin and glucagon secretion.

Adrenal Glands

Located on top of the kidneys; consist of the cortex and medulla and produce various hormones.

Gonads

Ovaries in females and testicles in males; produce sex hormones.

Placenta

Functions as an endocrine organ during pregnancy to support fetal development.

Melanocyte-Stimulating Hormone (MSH)

Hormone secreted by the pituitary gland that targets skin cells.

Adrenocorticotropic Hormone (ACTH)

Stimulates cortisol production in the adrenal cortex.

Prolactin

Hormone targeting the breast to promote milk production.

Oxytocin

Hormone that targets the breast and uterus, involved in childbirth and lactation.

Antidiuretic Hormone (ADH)

Regulates water retention in the kidneys.

Gonadotropins (FSH/LH)

Hormones that target the ovaries and testicles.

Growth Hormone (GH)

Promotes growth in bones and muscles.

Thyroid-Stimulating Hormone (TSH)

Stimulates the thyroid gland to release thyroid hormones.

Hyperpituitarism

Condition characterized by the excess secretion of pituitary hormones.

Hypopituitarism

Condition characterized by insufficient secretion of pituitary hormones.

Growth Hormone Deficiency (Pituitary Dwarfism)

Result of hyposecretion of growth hormone during childhood.

Gigantism

Hypersecretion of growth hormone during childhood resulting in abnormal growth.

Acromegaly

Hypersecretion of GH in adulthood, characterized by enlargement of extremities.

SIADH (Syndrome of Inappropriate ADH)

Condition involving hypersecretion of ADH leading to water retention and dilutional hyponatremia.

Diabetes Insipidus (DI)

Condition caused by insufficient ADH or kidney resistance, characterized by excessive urination.

Hypoparathyroidism

Condition characterized by low PTH, leading to low blood calcium levels.

Hyperparathyroidism

Condition usually caused by benign tumors leading to increased PTH and high blood calcium.

Hyperthyroidism (Graves' Disease)

Autoimmune disorder causing excess thyroid hormone production.

Hashimoto's Disease

Autoimmune hypothyroidism due to insufficient thyroid hormone production.

Goiter

Non-cancerous enlargement of the thyroid gland, causes may include hormonal changes.

Thyroid Cancer

Often presents as an asymptomatic mass, may require surgical intervention.

Cushing’s Disease

Excess cortisol levels due to a pituitary tumor producing excessive ACTH.

Cushing’s Syndrome

Excess cortisol levels caused by external factors, primarily corticosteroid medication.

Adrenal Insufficiency (Addison's Disease)

Condition characterized by inadequate production of adrenal hormones, affecting stress response.

Thyrotoxic Storm

Acute, life-threatening emergency related to hyperthyroidism, requiring immediate treatment.

Glucocorticoid Therapy

Treatment that involves administering corticosteroids to manage inflammation and other conditions.

Levothyroxine Education

Patients must be aware of long-term effects and timing of medication administration to avoid absorption issues.

Hyperpituitarism

Signs include headaches, vision problems, abnormal growth patterns, and excessive sweating. Treatment may involve medications to lower hormone levels, radiation therapy, or surgery to remove the tumor causing hormone excess.

Hypopituitarism

Signs include fatigue, weight loss, low blood pressure, and infertility. Treatment typically involves hormone replacement therapy to restore deficient hormones.

Growth Hormone Deficiency (Pituitary Dwarfism)

Signs include short stature and delayed growth in children. Treatment usually involves growth hormone therapy.

Gigantism

Signs include abnormal increase in height and size of extremities. Treatment can include surgical removal of pituitary tumors or medication to control hormone production.

Cushing’s Disease

Signs include weight gain, high blood pressure, easy bruising, and mood changes. Treatment may involve surgical removal of tumors or medications to reduce cortisol production.

Adrenal Insufficiency (Addison's Disease)

Signs include fatigue, weight loss, low blood pressure, and skin darkening. Treatment typically involves hormone replacement therapy with corticosteroids.

Diabetes Insipidus (DI)

Signs include excessive urination and thirst. Treatment usually involves desmopressin hormone replacement.

Hyperthyroidism (Graves' Disease)

Signs include increased heart rate, weight loss, anxiety, and heat intolerance. Treatment may consist of antithyroid medications, radioactive iodine, or surgery to remove the thyroid gland.

Hashimoto's Disease

Signs include fatigue, weight gain, sensitivity to cold, and depression. Treatment typically involves hormone replacement therapy with levothyroxine.