Recap 1 What gland produces the Growth Hormone

Recap 1. What gland produces the Growth Hormone (GH)? 2. What is melatonin? 3. Where is the thyroid gland located?

Endocrine System Homeostatic Imbalances Ch. 9 c

Hypo- vs. Hyper • Hypo – – Less than normal; deficient – Hyposecretion • Deficient hormone secretion • Hyper – – Excessive – Hypersecretion • Excessive hormone secretion

Pituitary Gland Imbalances • Hyposecretion of GH (Growth Hormone) – Dwarfism • Body proportions still fairly normal but with a maximum height of 4 feet • Hypersecretion of GH – Gigantism • 8 -9 feet is common • Most cases of hypersecretion results from a tumor of the affected gland

Thyroid Gland Imbalances • Goiters (Hyposecretion) – An enlargement of the thyroid due to an iodine deficiency • Graves’ Disease (Hypersecretion) – High metabolic rate – Rapid heartbeat – Bulging eyes

Parathyroid Gland Imbalances • Hyposecretion – Low blood calcium levels irritate neurons – Irritated neurons deliver rapid impulses to muscles causing uncontrollable spasms • Hypersecretion – Massive bone destruction – Bones become very fragile and spontaneous fractures occur

Adrenal Gland Imbalances • Addison’s Disease (Hyposecretion) – Peculiar bronze skin tone – Sodium and water are lost from the body causing muscle weakness • Cushing Syndrome – Results from a tumor on the adrenal cortex – Symptoms include a wide “moon face” and a hump ion the upper back “Moon Face” “Buffalo Hump”

Quick Quiz 1. Name one imbalance of the Parathyroid Gland. 2. What is one symptom of Cushing Syndrome? 3. Give the definitions of hypo- and hyper-.