12.1 The Endocrine Glands Flashcards
ductless glands or glands of internal secretions, are nests or clumps of cells having no ducts
Endocrine Glands
a secretion manufactures by and endocrine gland and secreted directly into blood capillaries
Hormone
these have two distinct parts, each secreting its own hormones
Double glands
some glands have an endocrine part to secrete one or more hormones, and an exocrine part to secrete enzymes
Mixed glands
some glands secrete more than one hormone
Glands with multiple functions
is a term used to include the chemical changes that occur n body cells as a result of cellular activity
Metabolism
is that of subject at rest
Basal metabolism
lies within the cranial cavity, in the pituitary fossa of the sella turcica
Pituitary gland or hypophysis
measures about 1.2 cm or 5 inches in diameter
Pituitary gland or hypophysis
double gland
Pituitary gland or hypophysis
is derived from a pouch of the third ventricle of the brain, hence the name ______
Posterior lobe,
neurohypophysis
stimulates the muscle of the uterus to contract during childbirth
Oxytocin or Pitocin
stimulates the reabsorption of water from the renal tubules, thus decreasing urinary output
Antidiuretic hormone (ADH) or vasopressin
It also stimulates contraction of the involuntary muscles of the intestine, bronchi, and blood vessels
Antidiuretic hormone (ADH) or vasopressin
is derived from a pouch of the mouth of the fetus
Anterior lobe
Anterior lobe alternate name
Adenohypophysis
Adenohypophysis has two type of cells
acidophils and basophils
It hormones have been names trophic hormones or tropic hormones perform because they stimulate the other endocrine glands to perform their functions (trophic = to nourish)
Adenohypophysis or Anterior lobe
lies within the cranial cavity, in the midline posterior to the midbrain
Pineal gland or body
It is minute structure of unknown function with a secretion that has not been isolated
Pineal gland or body
Two lobes, a right and left lying in the anterior neck
Thyroid Gland
Each lobe is about 5 cm or 2 inches in vertical length
Thyroid Gland
Thyroid Gland hormones
Thyroxine and tetraiodothyronine
These contain iodine that is obtained from water and food consumption
Thyroid Gland
to promote mental and physical development in the young
Thyroxine and tetraiodothyronine (Thyroid Gland)
Four small bean shaped bodies that lie in the neck posterior to the thyroid gland
Parathyroid Glands
There are two right and two left, superior and inferior
Parathyroid Glands
Each gland measures 6 mm or 0.25 inches in vertical diameter
Parathyroid Glands
Parathyroid Glands hormones
parathormone or parathyroid hormone
regulation of calcium metabolism, and its concentration in blood and tissues, especially in bones
parathormone or parathyroid hormone (Parathyroid Glands)
When calcium content is low, spasms (tetany) of the muscles or convulsions may occur
parathormone or parathyroid hormone
A mixed gland with exocrine and endocrine parts
Pancreas
Pancreas hormones
insulin and glucagon
stimulates body cells to use up (burn) glucose to produce energy, and promotes its storage in the liver, thus regulating the blood sugar concentration
Insulin
is said to have an opposite effect, promoting the release of glucose from the liver thus raising the blood sugar level
Glucagon
They are flat caplike structures and lie upon the upper end of the corresponding kidney
Suprarenal or Adrenal Glands
Each measures about 3 to 5 cm (or 1.2 to 2 inches) in diameter
Suprarenal or Adrenal Glands
is a double gland consisting of a medulla and cortex
Suprarenal or Adrenal Glands
is the central part
medulla
marrow
medulla
Suprarenal or Adrenal Glands hormones
o Adrenalin (e) or epinephrine o Noradrenalin (e) or norepinephrine
cause an increase in the rate of the heartbeat, and a cause contraction of blood vessels thus raising the blood pressure.
o Adrenaline or epinephrine
o Noradrenaline or norepinephrine
(Suprarenal or Adrenal Glands)
They cause dilatation of bronchi and are used to relieve the spasm of bronchial asthma
o Adrenaline or epinephrine
o Noradrenaline or norepinephrine
(Suprarenal or Adrenal Glands)
Stress “fear, flight or fight” response
o Adrenaline or epinephrine
o Noradrenaline or norepinephrine
(Suprarenal or Adrenal Glands)
outer part
cortex
bark
cortex
The hormones secreted by the suprarenal are named
corticoids, steroids, or corticosteroids
because they are secreted by the cortex
corticoids
because they were thought to resemble fats and have the steroid formula
steroids
a combination of the other 2 names: corticoids, steroids
corticosteroids
concerned with the metabolism of glucose, amino acids and fats
Glucocorticoids
cortisone
fats
that help to regulate the electrolyte (salt) balance of blood and tissues by promoting the reabsorption of water and sodium from the renal tubules of the kidneys (aldosterone)
Mineralocorticoids
salt
electrolyte
renal tubules of the kidneys
aldosterone
female and male similar to the hormones secreted by the ovaries and testes, but in lesser amounts
Gonadal hormones
Androgens
testosterone, androsterone
Some hormones are secreted by the lining membrane of parts of the digestive tract
- Gastrin
- Secretin
- Pancreozymin
- Cholecystokinin
These hormones may stimulate other digestive glands to secrete, to increase their secretion, or cause their ducts to contract and expel secretion
- Gastrin
- Secretin
- Pancreozymin
- Cholecystokinin
fatty preparations or foods are fed to patients to empty the gall bladder
Cholagogues
is a similar condition (of cretinism) that sometimes occurs at a later age
Myxodema
The individual becomes mentally and physically slow, appears lazy, and becomes overweight
Myxodema
is due to an over secretion of the hormones of the thyroid gland
Hyperthyroidism (Grave’s Disease or exophthalmic goiter)
The thyroid enlarges and the disease is characterized by nervousness, tremors, sleeplessness, rapid heartbeat, loss of weight, protruding eyeballs, and a high basal metabolic rate
Hyperthyroidism (Grave’s Disease or exophthalmic goiter)
refers to abnormally high linear growth
Gigantism
is a disorder that occurs when your body makes too much growth hormone (GH)
Acromegaly
is a condition caused by insufficient amounts of growth hormone in the body
Growth hormone deficiency (GHD), dwarfism or pituitary dwarfism
is an enlargement of the thyroid gland
simple goiter
is a severe deficiency of thyroid hormone in newborns
Congenital hypothyroidism, cretinism
is a condition resulting from insufficient secretion of parathyroid hormone
Hypoparathyroidism
It results in muscular spasms, twitchings, and sometimes convulsions due to low percentage of calcium in the circulation blood
Hypoparathyroidism
is due to excessive secretion of the parathyroid hormone from a tumor, etc.
Hyperparathyroidism
is a condition resulting from a decrease in hormones secreted by the cortex of suprarenal glands
Addison’s Disease
There is muscular weakness, low blood pressure, and pigmentation of the skin
Addison’s Disease
There is an increase in the sodium and water secretion by the kidneys
Addison’s Disease
tumors in the cortex of the suprarenal gland
Cortical Tumors