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z-Test #5 Endo,Sex,Imun
UCF Physio
25
Physiology
Undergraduate 3
04/28/2009

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Term
G-protein
Definition
Ligand binds to the G-protein receptor then stimulates alpha-s or alpha-i then activates AC (which is the second messenger) then it increases cAMP and shows its physiological function.
Term
Growth Factor
Definition
Thyrosin binds to growth factor receptor and activates thyrosin kinase and then stimulates IP3 (which is the second messenger) Binds insulin, EGF, and IGF.
Term
Cytokine
Definition
Jak2 binds to ligand and activates thyrosine kinase which triggers signals.
Term
Ligand-regulated
Definition
ligand opens ion channels, ions act as secondary messengers, NOS (nitric oxide)concentration increases which stimulates GC, PFG is stimulated and vasorelaxation happens.
Term
Nuclear receptors
Definition
transcrption on the DNA of the nucleus of cell and then translation into the cytoplasm
Term
Steroid hormones
Definition
produced from cholesterol
Term
Autocrine
Definition
When hormone acts on receptors located on the same cell.
Autocrine actions may be important in promoting unregulated growth of cancer cells.
Term
Intracrine
Definition
Hormones can also act inside the cell without being released, an
intracrine effect.
Term
Synergistic effects
Definition
Example: epinephrine and norepinephrine on the heart, each hormones separately produces an increase in cardiac rate.
Term
Permissive effects
Definition
Example: Cortisol and catecholamines
Term
Antagonistic effects
Definition
Example: insulin and glucagon.
Term
cell surface receptors
Definition
e.g., insulin, growth hormone, prolactin.
Term
intracellular receptors
Definition
e.g., steroids, thyroid hormone.
Term
Zona glomerulosa
Definition
produces mineralocorticoids (aldosterone)
Term
Zona fasciculata
Definition
produces mostly glucocorticoids (cortisol)
Term
Zona reticulata
Definition
produces sex hormones (mostly androgens, dehydroepiandro-sterone and androstenedione).
Term
Adrenocortical insufficiency
Definition
Addison’s disease
Term
Adrenocortical excess
Definition
Cushing’s syndrome
Term
Hyperaldosteronism
Definition
Conn’s syndrome
Term
I- to I2
Definition
Oxidation
Term
I2 to MIT or DIT
Definition
Organification
Term
MIT + DIT or DIT + DIT
Definition
Coupling
Term
Iodinated thyroglobulin
Definition
stored in the follicular lumen until the thyroid gland is stimulated to secrete thyroid hormones.
Term
Regulation of thyroid hormone secretion
Definition
hypothalamus (TRH) -> Ant. pituitary (TSH) -> Thyroid (T3, T4)
Term
Actions of thyroid hormone
Definition
CONG
Cardio
O2
Nero
Growth

1. Growth
2. Central nervous system (CNS)
3. Autonomic nervous system
4. Basal metabolic rate (BMR)
5. Cardiovascular and respiratory systems
6. Metabolic effects
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