extra Flashcards
what kind of hormone is insulin
peptide hormone
what kind of hormones cause gene activation
lipophilic hormones
how many and what are the mechanisms of lipophilic hormmones
either gene activation by binding to cytoplasmic or nuclear receptors
or surface receptors that activate second messenger systems- NON genomic action
what feedback mechanism do neural reflexes use
feed forward
what does an organism use to regulate its internal conditions
feedback mechanisms
what are the parts of the ECF
plasma
interstitial fluid
what between endocrine and nervous system uses the same mechanism
secretion of hormones and neurotransmitters
how is hormone availability controlled
- secretion
- activation of some hormones
- binding of lipophilic hormones to plasma proteins
- inactivation
what is happening in both negative and positive feedback
a signal is continuously stimulating hormone secretion
what does a variable have
a set point
what kind of hormone leads to activation of intracellular enzymes that generate second messengers that amplify the hormone signal
peptide/ hydrophilic hormones
what kind of hormone has signal amplification
hydrophilic hormones
what causes vasoconstriction, where are these cells and what does this do
vasopressin
in the vascular smooth muscle
maintains blood pressure
where does ADH bind to in the collecting ducts
AVPR2 receptors
what kind of tissue makes up the posterior pituitary
nervous tissue