Animal Form and Function- { The Endocrine System] Flashcards
What is the purpose of the Endocrine System?
The endocrine system produces HORMONES that help maintain homeostasis and regulate reproduction and development.
Endocrine-
synthesize and secretes hormones into bloodstream.
Exocrine
Secrete substances into ducts(Ex - Gall Bladder) (Pancreas is both exo and endo)
Protocrine
Autocrine -
Protocrine -Cell signaling where target is nearby.
Autocrine - is cell signaling via hormone/chemical messenger that binds to receptors or same cell.
Prostaglandins
Causes contraction/relaxation.
They are local regulators that promote inflammation and sensation of pain in response to injury.
General characteristics of hormone:
They are transported throughout body in blood ; small amount = large impact; slower effect.
Hormone Types
- Peptide
- Where is it manufactured and where do it end up?
- Describe some peptide hormones
Synthesized in rough ER and modified in Golgi, acts on surface receptors
-Manufactured in rough ER—->clevages in ER lumen —–> Final form is in Golgi.
They include (AP) FSH, LH, hGH, TSH, prolacting; glucagon, insulin
Hormone Types
- Steroid
- Where are they made?
- Hydrophobic or hydrophillic?
- Synth’d from cholesterol in smooth ER; hydrophobic = freely difuse but require protein transport molecule to dissolve in blood.
Hormone Types
-Tyrosine Derivatives -how is it formed?
Thyroid hormones?
Catecholamines(epi and norepi)
Tyrosine Derivatives - Formed by enzymes in cytosol or on rough ER.
Thyroid Hormones - lipid soluble, require protein from blood
Catecholamines - formed in adrenal medulla; epi and norepi.
Hypothalamus
- NEUROSECRETORY
- PITUITARY GLAND
- INHIBITING HORMONES
- OXYTOCIN/ ADH
Monitors the external environment and internal conditions of the body. Contains NEUROSECRETORY cells that link the hypothalamus to the PITUITARY GLAND. Regulation of the pituitary = negative feedback mechanisms by secreation of releasing and INHIBITING HORMONES. Secretes ADH and OXYTOCIN to be stored in posterior pituitary; also secretes GnRH from neurons, which stimulates anterior pituitary to secrete FSH and LH
Hypothalamus
-Anterior Pituitary -
Gland: Anterior Pituitary
Hormone: GH
Action: Cell Growth
Hypothalamus
- Anterior Pituitary - TROPIC HORMONES
- ACTH
- TSH(Thyroid-stimulating hormone)
- LH -(females)- corpus luteum, Males
- FSH -(males and females_
Anterior Pituitary(TROPIC HORMONES) = stimulate other endocrine glands.
ACTH - Target: Adrenal Cortex
Action: Secretion of glucocorticoids
TSH(thyroid-stimulating hormone) -
Target:Thyroid
Action:Secretion of T4 and T3
LH-
Target: Ovaries, testes
Action: Regulates oogenesis & spermatogenesis
FSH (Follicle stimulating hormone) =
Target: ovaries, testes
Action: regulates oogenesis & spermatogenesis
Posterior Pituitary- does it or does it not make hormones? What does it store?
Does not synthesize hormones, STORES ADH and oxytocin produced by hypothalamus.
Posterior Pituitary-
hormone?
Action?
Target: Kidneys, mammary glands
Hormone: ADH(antidiuretic)
Action: Increases reabsorption of water
- Collecting duct –> water reabsorption and increased blood volume and pressure. Coffee blocks ADH.
- Oxytocin - secreted during childbirth - increases strength of uterine contractions and stimulates milk EJECTION
Pineal Gland -
Hormone: melatonin.
Action: role in circadian rhythm(internal clock).
Thyroid - gland? Hormone? Action?
-Calcitonin?
- Hypothyroidism -
- Hyperthyroidism -
- Located on ventral surface of trachea.
Target: bone
Hormone: T3/T4
Action: Regulates metabolism, lowers blood Ca+
Hypothyroidism - undersecretion —-> low heart rate and respiratory rate.
Hyperthyroidism - oversecretion—> increased metabolic rate and sweating
* Both lead to GOITERS
Disorders of the thyroid:
* Anchondroplasia * Progeria
- Anchondroplasia - DWARFISM
* Progeria = PREMATURE AGING
Parathyroid hormone (PTH)- Hormone? Target?Action?
Hormone: Parathyroid hormone (PTH)
Target: bone
-Action: Increases Ca2+ concentrations in blood
Thymus - What is it involved in?
* Thymosins * T-cells
Thymus - involved in immune response
-Secretes THYMOSINS that stimulate lymphocytes (WBCs) to become T-CELLS(identification & destroying of infected body cells.
Adrenal Gland - Where is located?
- Adrenal Cortex
Hormone?
Action?
Adrenal Gland - located on top of kidneys and consists of
Hormone: Glucocorticoids(ex: cortisol) Eg: Aldosterone.
Target: general, kidney
Action: increases blood glucose, increases reabsorption of Na and K+.
Adrenal Medulla
Hormone?
Target?
Action?
Adrenal gland (Medulla)
Hormone: Epinephrine & norepinephrine
Target: blood vessels, liver and heart.
Pancreas - exocrine or endocrine? *Islet of Landerhans 2 cell types *Alpha cells -Hormone/action * Beta Cells - Hormone/action *Somatostatin
Pancreas - both exocrine & endocrine; has bundles of cells called ISLET OF LANDERHANS which contains 2 cell types:
Pancreas(alpha) -
Hormone: Glucagon
Target: liver
Action: increases blood glucose
Pancreas(beta)
Hormone: insulin
Target: liver, muscles, fat
Action:lowers blood glucose
SOMATOSTATIN - is released by delta cells of pancreasel inhibits both insulin and glucagon possibly increases nutrient absorption time.
Testis - Testosterone
Testosterone - spermatogenesis, secondary sex characteristics.
Ovaries:
Estrogen-
Progesterone -
Estrogen - menstrual cycle, secondary sex characteristics.
Progesterone - menstrual cycle, pregnancy.
Gastrointestinal hormones
*Gastrin-
Gastrointestinal hormones
*Gastrin- food in stomach, stimulates secretion of HCL
Gastrointestinal hormones
- Secretin-
- Cholecystokinin-
SECRETIN = small intestine - when acidic food enters from stomach —> neutralize acidity of chime by secretion of alkaline bicarbonate.
CHOLECYSTOKIN - Small intestine -presence in fats —-> causes contraction of gall-bladder and release of BILE(involved in digestion of fats.
Posterior Pituitary: Hormones, Target(which organs?), What is the function?
Posterior Pituitary:
Hormones - ADH(antidiuretic hormone)
- Oxytoxin
Target: Kidney, mammary glands
Function: Increases reabsorption of water. Milk letdown.
Anterior Pituitary (tropic hormones) -
Hormones, Target(which organs?), What is the function?
Anterior Pituitary (tropic hormones) -
Hormones - TSH(thyroid stimulating hormones)
- ACTH(adrenocorticotropic hormones) - FSH (follicle stimulating hormones) - LH (luteinizing hormones
Target: Thyroid, Adrenal Cortex, Ovaries, testes
Function: Secretion of T4 and T3.
- Secretion of glucocorticoids - Regulates oogenesis and spermatogenesis (both)
Anterior Pituitary(hormones) Hormones, Target(which organs?), What is the function?
Anterior Pituitary(hormones)
Hormones: PRL(prolactin)
GH(Growth hormones)
Target: Mammary glands, bone, muscle
Function: Production of milk
Stimulates growth
Pancreas (Alpha cells)
-Hormones, Target(which organs?), What is the function?
Hormones: Glucagon
Target: liver
Function: Raise blood sugar
Pancreas (Beta cells)
-Hormones, Target(which organs?), What is the function?
Hormones: Insulin
Target: Liver, muscles, fat
Function: Lowers blood sugar
Adrenal Gland(medulla)
-Hormones, Target(which organs?), What is the function?
Hormones: Epinephrine(adrenalin) and norepinephrine (noradrenalin)
Target: Blood vessels, live and heart.
Function: Fight or Flight
Adrenal Gland (cortex) -Hormones, Target(which organs?), What is the function?
Hormones:Glucocorticoids(CORTISOL)
Mineralocorticoids (ALDOSTERONE)
Target: General Kidney
Function: Secretes anti-inflammatory.
Thyroid
-Hormones, Target(which organs?), What is the function?
Hormone: T4(thyroxin) and T3(triiodothyronine)
- Calcitonin
Target: General Bone
Function: Increases cellular metabolism and lowers blood Ca2+
Parathyroid
-Hormones, Target(which organs?), What is the function?
Hormones:Secretes PTH(parathyroid)
Target: Testes, general
Function: Spermatogenesis, 2nd sex char.
Ovary
-Hormones, Target(which organs?), What is the function?
Hormones: Give off Estrogen, Progesteron
Target: Uterus,
Function: Menstrual cycle, 2nd sex char. pregnancy.
Pineal
-Hormones, Target(which organs?), What is the function?
Hormones: Melatonin
Target: body
Function: Circadian rhythms
Testes
Hormone?
Action?
Hormone: Give off Testosterone
Action: Male sex characteristics