Week 11 - Hormonal Regulation Flashcards
define: endocrine gland
- a gland that secretes hormones directly into the blood
define hormones
- chemical that stimulates cellular action in a target cell
define receptor site
- location on a cell which hormones attach & trigger an effect
describe the scope of hormonal regulation
- normal physiological range
- excess hormone lvl =hyper
- deficient hormone lvl = hypo
what is a negative feedback loop
- type of self regulating system
- information about a hormone lvl is communicated to the gland that secretes the hormone, directing the need for more or less of that hormone
ex. as plasma lvls of T3 and T4 rise, further secretion is inhibited
what is a positive feedback loop
- when the secretion of a hormone stimulates more secretion of that hormone
what is a biological rhythmn
- type of feedback control
- the secretion of hormones is based of biological rhythmns
what is an example of a hormone controlled via biological rhythmn
- the release of cortisol is influenced by the carcadian rhythmn
- cortisol secretion is highest in the morning and lowest in the evening
describe the role of CNS as a feedback control
- controls secretion of hormones thru CNS stimulation
ex. epi and norepi is released during a stressful system from the adrenal medulla
what are 3 possible causes of problems w glands
- trauma
- congenital
- inflammation
what are 3 possible causes of problems with regulation
- signalling errors
- physiological triggers
- tissue insensitivity
what are the 2 primary communicating & coordinating systems in the body
- endocrine &
- NS system
how does the nervous system communicate
thru nerve impulses
how does the endocrine system communicate
- thru hormones
