Endocrine System Flashcards
Cells that line glands?
Epithelial cells
Extract raw materials from capillaries and secret substances.
Glands
Two types of glands
- Endocrine
* Exocrine
Glands that have ducts where secretions are discharged.
Exocrine glands
Glands that have no ducts, discharge secretions directly into the blood.
Endocrine glands
Secretions of endocrine glands?
Hormones
Have 2 distinct parts, each secreting its own hormones?
Double glands
Glands that have an endocrine and exocrine portion?
Mixed glands.
Glands that secrete more than one hormone?
Glands with multiple functions
Hormones secreted by one gland may stimulate other glands.
Interrelationship of Glands
A chemical that influences or controls the activity of a specific tissue or organ?
Hormones
Greek word for hormone?
Hormon
Meaning of hormon?
To set into motion.
Where are hormones secreted?
Blood stream via capillaries.
Two types of hormones?
- Amino acid Base
* Steroid Base
Pass through plasma membrane and bind to receptors present in the cytoplasm?
Steroid hormones
Hormone that requires a primary and secondary messenger?
Amino acid base hormone
Adaptive response that dampens or cancels the change brought by stimulus.
Negative feedback
List the glands of the endocrine system
- Pituitary gland
- Pineal gland
- Thyroid glad
- Parathyroid gland
- Pancreas
- Adrenal gland
- Gonads
Other name for pituitary glands?
Hypophysis
Organ that hangs by a stalk from the hypothalamus?
Pituitary gland
Where does the pituitary gland hang from?
Hypothalamus
Short stalk that supports the pituitary gland?
Infundibulum
Protects and houses the pituitary gland?
Sella Turcica
Diameter of pituitary gland?
1.2 cm
Known as the master gland of the endocrine system?
Pituitary gland
The part that controls the pituitary gland?
Hypothalamus
Regions of the pituitary gland?
- Anterior pituitary gland
* Posterior pituitary gland
Alternative name for posterior pituitary gland?
Neurohypophysis
Hormones stored by the posterior pituitary gland?
- Oxytocin
* Antidiuretic Hormone
Where is oxytocin and ADH produced?
Hypothalamus
Target tissue of oxytocin?
Uterus.
Increase contractions during labor, also stimulates release of milk.
Oxytocin
Alternative name for vasopressin.
Antidiuretic hormone
Target tissue of antidiuretic hormone?
Kidney
Stimulates the reabsorption of water from renal tubules, decreasing urinary output.
Antidiuretic hormones
Inability to produce ADH results in?
Diabetes insipidus
Alternative name for anterior pituitary gland?
Adenohypophysis
Produce trophic hormones that stimulate other endocrine glands to perform their function.
Anterior pituitary gland
Type of hormone produced by the anterior pituitary gland that stimulate other endocrine glands to perform their functions?
Trophic hormones
Hormones produced by the anterior pituitary gland?
Growth hormone Thyroid stimulating hormone Adrenocorticotropic hormone Gonadotropic hormone Prolactin Melanocyte stimulating hormone
Alternative name for growth hormone?
Somatotropin.
Hormone that stimulates growth of bones, muscles and organs?
Growth hormone
Target tissue of somatotropin?
Most cells
Effect of too much somatotropin?
Gigantism
Effect of too little somatotropin?
Pituitary dwarfism
alternative name for thyroid stimulating hormone?
Thyrotropin
Target tissue of thyrotropin?
Thyroid gland
Hormone that stimulates the growth of the thyroid and regulates the thyroid gland secretion?
Thyrotropin
Target tissue of adrenocorticotropic hormone?
Adrenal cortex
Hormone that stimulates the cortex of the adrenal gland to secrete its hormones?
Adrenocorticotropic.
Hormone produced after childbirth that initiates and maintains milk production ?
Prolactin
Two hormones that fall under gonadotropic hormones?
- Luteinizing hormones
* Follicle Stimulating hormones
Target tissue of prolactin?
Mammary glands
Target tissue of luteinizing hormones in females?
Ovary
Responsible for ovulation and stimulates the follicle to develop into corpus luteum?
Female luteinizing hormones?
Hormone that stimulates interstitial cells of the testes to secrete testosterone?
Male Luteinizing hormone
Hormone that stimulates the formation of melanin pigment?
Melanocyte stimulating hormone
Target cells of melanocyte?
Melanocyte stimulating hormones
What controls the pituitary gland?
Hypothalamus
Organ located between the thalamus, near the lower walls of the third ventricle of the brain?
Hypothalamus
Part of the brain that helps regulate the body’s internal environment?
Hypothalamus
Controls the anterior pituitary gland, aids in the production of hypothalamic-releasing and release-inhibiting hormones?
Hypothalamus
What are the two types hypothalamic hormones?
- Releasing Factors
* Inhibiting Factors
What are the releasing factors of the hypothalamus?
- Thyroid Releasing Hormones
- Corticotropin Releasing Hormones
- Prolactin Releasing Hormones
- Gonadotropin Releasing Hormones
- Somatotropin Releasing Hormones
What are the inhibiting factors of the hypothalamus?
- Prolactin Inhibiting Factor
* Somatotropin Inhibiting Factor
Located in the front and sides of the trachea below the larynx?
Thyroid gland
Consists of two lobes, left and right with a middle piece called the isthmus?
Thyroid gland
Mid piece of the thyroid gland?
Isthmus
Structural unit of the thyroid gland?
Thyroid Follicle
What are the hormones produced by the thyroid follicle?
T4 and T3
What is T4 produced by the thyroid follicles?
Thyroxine
What is T3 produced by the thyroid follicles?
Triiodothyronine.
Regulates energy production and protein synthesis?
T3 and T4 of thyroid.
Chemical element necessary for the synthesis of Thyroxine and Triiodothyronine?
Iodine
Result of hypertrophy of thyroid gland?
Simple goiter.
Target tissue of calcitonin?
Bones
Secreted when blood Ca levels are high, increases the buildup of bones?
Calcitonin.
State of having high blood calcium levels?
Hypercalcemia.
How many parathyroid glands are there?
4.0
Where are the parathyroid glands?
Posterior to thyroid glands.
Two lobes of the thyroid gland?
Left and Right Lobe
Hormones produced by the parathyroid glands?
Parathyroid hormones
Acts as an antagonist to calcitonin, causes calcium levels in blood to increase, while phosphate decreases by promoting bone breakdown and calcium retention?
Parathyroid hormone
Target tissue of parathyroid hormones?
Bones, Kidneys, small intestines
What organ increases calcium absorption when parathyroid hormones are released?
Small intestines.
State of low blood calcium?
Hypocalcemia
An organ with both endocrine and exocrine functions found near the duodenum?
Pancreas
Exocrine function of the pancreas?
Manufactures pancreatic juice
Endocrine function of pancreas?
Produce glucagon and insulin.
What cells in the pancreas produce hormones?
Islets of Langerhans
Two cells found in the Islets of Langerhans?
Alpha and Beta Cells
Alpha cells produce?
Glucagon
Beta cells produce?
Insulin
Hormone released by the pancreas when blood is low?
Glucagon
Glucagon breaks down what?
Glycogen into glucose.
Target cell of glucagon?
Liver
State of having low blood sugar?
Hypoglycemia
Released when blood levels of glucose are high?
Insulin
Target tissue of insulin?
Liver, skeletal muscles, adipose tissue
Insulin does what?
Promotes use of glucose
State of high blood glucose?
Hyperglycemia
Disease with too little insulin?
Diabetes Mellitus
Insulin dependent diabetes type?
Type 1
Insulin independent diabetes type?
Type 2
Gland found on top of the kidneys?
Adrenal glands
Parts of the adrenal glands?
Adrenal Medulla Adrenal Cortex
The adrenal medulla secretes what hormones?
Epinephrine Norepinephrine
Hormones produced by the adrenal cortex?
- Mineralcorticoids
* Glucocorticoids
Alternative name of epinephrine?
Adrenalin
Alternative to adrenalin?
Epinephrine.
Alternative name for norepinephrine?
Noradrenalin
Alternative name for noradrenalin?
Norepinephrine
Target tissue of epinephrine and norepinephrine?
Heart, Blood vessels, Liver, Fat
Most abundant mineralocorticoids?
Aldosterone
Target tissue of aldosterone?
Kidneys
Hormone that causes Na and H2O to be retained and K to be secreted by the kidneys?
Aldosterone
Stimulates the release of aldosterone?
Sodium Deficiency, dehydration or elevated blood potassium.
Cortisol is what type of hormone?
Glucocorticoid
Increases the breakdown of fat and protein for energy use, also reduces inflammatory and immune response?
Cortisol
Hormone which inhibits the secretion of FSH
Inhibin
Inhibin in the testicles is produced where?
Sustentacular cells
Located at the back of the third ventricle of the brain?
Pineal Gland
Gland that produces melatonin?
Pineal Gland
What hormone does the pineal gland produce?
Melatonin
Hormone which controls puberty and circadian rhythm?
Melatonin
What external factor affects melatonin?
Light
Other hormone producing organs?
Stomach Kidney Placenta Small Intestine
Hormone released by the stomach?
Gastrin
Hormone released by the kidney?
Erythropoietin
Hormones released by the placenta?
CRH and Human Chorionic Gonadotropin
Hormones released by the small intestines?
Secretin Cholecystokinin Pancreozymin
Hormone produced by the thymus?
Thymosin
Hormone that promotes the immune system development and function?
Thymosin