Endocrine Flashcards
endocrine system regulated by
feedback loops
all animals use ____
endocrine signals
where are chemical signals carried
body fluids
gland definition
organ/tissue responsible for synthesis and secretion of cellular products
endocrine definition
secretion of material into extracellular spaces or blood vessels
hormone
signaling molecule secreted by endocrine cells
regulates physiology, behavior, development
exocrine
secretion of material onto a body surface or into a duct
non-steroid hormones
cannot pass through membrane by simple diffusion
hormones binding to plasma membrane are derived from ___
amino acids
fast hormones
bind to plasma membrane receptors
slow hormones
bind to intracellular receptors
hormones binding to inside of cell are ___
lipids derived from cholesterol
hormones produced in a synthesis pathway can ___
act as a hormone or neurotransmitter
where are hydrophilic hormones stored
secretory vesicles
diversity of steroids made from ___
cholesterol
what regulates hormone levels in blood/fluid
homeostatic feedback loops
altering rate of hormone synthesis or secretion
endocrine messengers produced by:
all tissues
body fluids
are a soup of messengers
what cells will respond to a hormone
only cells with the specific receptor
what produces steroid hormones
only adrenal glands and sex organs
hypothalamus
control center of endocrine system, acts through pituitary gland
posterior pituitary
nervous tissue that stores and secretes hypothalamus hormones
anterior pituitary
glandular tissue that produces and secretes its own hormones
TRH
TSH releasing hormone
TSH
thyroid-stimulating hormone
thyroxine
increases metabolic rate
growth hormones
promotes protein synthesis and use of body fat for energy
promotes development and enlargement of all body parts
thyroid gland
multifunctional role in body function and homeostasis
produces T4 and T3
people with an iron deficiency
hypothyroidism (enlargement of thyroid)
acute response
almost immediate
due to activation of sympathetic division
chronic response
delayed response by few minutes
due to activation of hypothalamo-pituitary axis
acute phase
-prepares body for immediate survival
-prolongs body response in flight or fight response
-adrenal gland secretes two hormones (epinephrine & norepinephrine) when sympathetic NS is max active
chronic phase
prepares body to cope with stress over long time
cortisol or corticosterone
response from minutes to days
sex hormones produced by:
gonads (ovaries, testes) and adrenal glands
estrogens
maintain female reproductive system, development of female features
progestins
prepare uterus to support embryo
androgens
stimulate embryo to become male, maintain male reproductive system
sex hormones regulated by:
hypothalamus and anterior pituitary