Chapter 16 - The Endocrine System Flashcards
hormones
signaling molecules secreted into the bloodstream
paracrine factors and neurotransmitters travel to , hormones travel to
near cells only, near and far cells
the endocrine system is made of
glands, tissues, hormone-secreting cells
endocrine glands
organs that secrete hormones
speed of the endocrine system
slow response and a long, persistent effect
adaption of endocrine system to stimulus
very slow
area of effect of the endocrine system
variable, generous or specific
exocrine glands function
secrete substances through ducts
duct
tube that delivers secretion to an epithelial surface or the mucosa of the digestive tract
does the exocrine gland do intracellular or extracellular communication
extracellular
products of the exocrine gland
sweat, saliva, digestive enzymes, mucus
endocrine glands produce
hormones that cause intracellular changes in target cells
endocrine glands are for intracellular or extracellular communication
intracellular
endocrine glands are penetrated by
capillaries into which hormones are secreted
hormones are/are not secreted at a continuous rate
are not
types of rhythmic secretions
circadian rhythm, monthly cycle
example of a circadian rhythm
melatonin
types of stimuli secretions
neural, hormonal, humoral
neural stimuli secretion process
nerve signals endocrine system to secrete hormones
example of a neural stimulated secretion
sympathetic stimulus of adrenal medulla
hormonal stimulating secretion process
hormones stimulate another source’s secretion
example of hormonal stimulated secretion
hypothalamus stimulates the anterior pituitary gland
humoral stimulating secretion process
blood levels of some substance stimulates hormone secretion
example of humoral secretion stimulation
blood glucose
hormone classes
steroid, monoamine, peptides
steroids are derived from
cholesterol
monoamines are derived from
an amino acid
peptides are derived from
multiple amino acids
monoamines and peptides travel through
blood plasma
monoamines and peptides are hydrophobic/hydrophilic
hydrophilic
steroids travel by
binding to transport proteins that travel through the blood streams
steroids are hydrophobic/hydrophilic
hydrophobic
example of a transport protein to which steroid
albumin
hormone receptors are specific/general
specific, only stimulate the cells with the specific receptors for that hormone
how are hormone receptors sensitive
more receptors on the cell make a cell more sensitive to the effects of the hormone
long term exposure to a hormone causes
less expression / more cell sensitivity
types of hormones receptors
membrane receptors and intracellular receptors