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Endocrine System: Hormonal Regulation of Calcium Study Guide

This guide explores the adrenal glands, a vital part of the endocrine system. Learn about the adrenal cortex and medulla, the hormones they secrete like aldosterone, cortisol, and epinephrine, and their crucial functions in regulating stress, metabolism, and fluid balance. Understand common clinical conditions associated with adrenal dysfunction and the integrated roles of these glands within the broader endocrine system.

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Overview of the Endocrine System

Overview of the Endocrine System

Organs of the endocrine system synthesize and secrete chemical messengers called hormones into the blood to interact with specific target cells and tissues.

  • Hormones
  • Target Cells
  • Target Tissues
  • Receptors
  • Endocrine Glands
  • Neuroendocrine Organs
  • Steroid Hormones
  • Upregulation
  • Downregulation
  • Second-Messenger System

Regulation of Hormone Secretion

Hormone secretion can be initiated by hormonal, humoral, or neural stimuli and is usually regulated as part of a negative feedback loop.

  • Hormonal Stimuli
  • Humoral Stimuli
  • Neural Stimuli
  • Negative feedback loop
  • Homeostasis
  • Hypothalamus
  • Anterior pituitary
  • Releasing and Inhibiting hormones

Hypothalamus and Pituitary Gland Structure

The hypothalamus connects to the pituitary gland via the infundibulum to regulate hormone secretion through the hypothalamic-hypophyseal portal system and neurohormones.

  • Hypothalamus
  • Anterior Pituitary Gland (Adenohypophysis)
  • Posterior Pituitary Gland (Neurohypophysis)
  • Infundibulum
  • Hypothalamic-Hypophyseal Portal System
  • Antidiuretic Hormone (ADH)
  • Oxytocin
  • Releasing and Inhibiting Hormones
  • Adrenocorticotropic Hormone (ACTH)

Functional Relationship of Growth Hormone

Growth hormone produced by somatotrophs regulates growth, protein synthesis, and metabolic effects through the functional relationship of the hypothalamus and anterior pituitary.

  • Growth Hormone (GH)
  • Somatotropin
  • Insulin-Like Growth Factor (IGF)
  • Growth Hormone–Releasing Hormone (GHRH)
  • Somatostatin
  • Lipolysis
  • Gluconeogenesis

Thyroid and Parathyroid Gland Anatomy

This material covers the structure of the thyroid and parathyroid glands, including thyroid follicles, follicle cells, colloid, and parafollicular cells.

  • Thyroid gland structure
  • Thyroid follicles
  • Follicle cells
  • Colloid
  • Parafollicular cells
  • Calcitonin
  • Parathyroid glands
  • Chief cells
  • Parathyroid hormone

Thyroid Hormones and Metabolic Regulation

Thyroid hormones consist of triiodothyronine and thyroxine which regulate metabolic rate, thermoregulation, growth, and development through negative feedback loops.

  • Triiodothyronine (T3)
  • Basal Metabolic Rate
  • Thermoregulation
  • Thyroglobulin
  • Thyroid-stimulating hormone (TSH)
  • Hyperthyroidism
  • Hypothyroidism

Parathyroid Hormone and Calcitonin Bone Homeostasis

Parathyroid Hormone and Calcitonin Bone Homeostasis

Regulation of blood calcium ion concentration through the actions of parathyroid hormone and calcitonin on bone, kidneys, and small intestine.

  • Parathyroid Hormone (PTH)
  • Calcitonin
  • Bone homeostasis
  • Osteoclasts
  • Osteoblasts
  • Negative feedback loop
  • Calcium ion reabsorption

Hormones of the Adrenal Glands and Pancreas

Structure and Function of the Adrenal Glands

The adrenal glands consist of an outer adrenal cortex and an inner adrenal medulla that produce steroid hormones, catecholamines, and regulate fluid, electrolyte, and metabolic homeostasis.

  • Mineralocorticoids
  • Glucocorticoids
  • Cortisol
  • Androgenic steroids
  • Chromaffin cells
  • Catecholamines
  • Epinephrine
  • Norepinephrine
  • Gluconeogenesis

Hormones of the Endocrine Pancreas

Hormones of the endocrine pancreas regulate glucose homeostasis through the actions of glucagon and insulin.

  • Glucose homeostasis
  • Pancreas
  • Insulin
  • Hyperglycemia
  • Hypoglycemia

Blood Glucose Regulation and Homeostasis

Maintaining homeostasis through the regulation of blood glucose levels via insulin and glucagon secretion.

  • Blood glucose regulation
  • Homeostasis
  • Insulin secretion
  • Glucagon secretion
  • Beta cells
  • Alpha cells
  • Pancreas
  • Glucose uptake
  • Glycogen breakdown

Hormones Produced by Other Endocrine Organs

This content discusses hormones produced by various endocrine organs and hormone-secreting tissues to regulate metabolic homeostasis, fluid homeostasis, and reproductive functions.

  • Testosterone
  • Estrogens
  • Progesterone
  • Melatonin
  • Leptin
  • Erythropoietin
  • Metabolic Homeostasis
  • Thyroid hormones
  • Insulin
  • Catecholamines
  • Fluid Homeostasis
  • ADH

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