Endocrine System Flashcards
Chemical signals secreted by cells or glands which influence the actions of other cells within the body (chemical messenger)
Hormones
Endocrine system regulates:
-Responses to the environment
-Growth and development
-Homeostasis
-reproduction
_________ are released to trigger the development of secondary sex characteristics as an animal approaches adulthood
Sex Hormones
_______ and _________ in insects is triggered by the release of hormones in tissues in the head
Molting and Metamorphosis
neuron cells that secrete hormones rather than neurotransmitters
neurosecretory cells
growth regulation is primarily controlled by the _______
pituitary gland
produces the human growth hormone
pituitary gland
endocrine organ that regulates blood sugar via negative feedback loop
pancreas
negative feedback loops are used to maintain ________
homeostasis
Have a destabilizing impact used to precipitate a particular event like childbirth
Positive feedback loop
-May be on the cell surface
-may be inside a cell
-which depends on the molecular makeup of the hormone
Hormone Receptors
what are the two groups of hormones
-hydrophilic
-hydrophobic
can not cross cell membrane (peptides and amines)
Hydrophilic
can cross cell membranes (steroids)
Hydrophobic
-more abundant
-more diverse
-work in minutes to hours
-typically initiate signal cascades that activate or repress enzymes
-changes cell shape, size, division, or triggers release of another hormone
Amine and peptide hormones