hormones Flashcards
major endocrine structures
hypothalamus, pineal, pituitary, thyroid, adrenal, pancreas, gut, gonads
control of hormonal secretions
hypothalamus
pineal gland
reproductive maturation, body rhythms
anterior pituitary
hormone secretion by thyroid, adrenal cortex, and gonads, growth!
posterior pituitary
water and salt balance
thyroid
growth and development, metabolic rate
adrenal cortex
salt and carb metabolism, inflammatory reactions
adrenal medulla
emotional arousal
pancreas
sugar metabolism
gut
digestion and appetite control
gonads (testes and ovaries)
body development, maintenance of reproductive organs
endocrine communication
goes straight into bloodstream to affect distant organs
types of chemical communication
1) endocrine
2) synaptic
3) autocrine
4) paracrine
5) pheromone
6) allomone
2 exterior chemical communications
pheromone and allomone
AKA neurocrine function
release of chemical signal (NT) into synaptic cleft to affect postsynaptic membrane
paracrine communication
chemical signal diffuses to nearby cells
pheromone communication
pheromones release into outside environment to affect other individuals of same species
allomone communication
allomones released by members of one species to affect behaviors of another species
principles of hormones
1) hormones act gradually
2) hormones change intensity and probability of behavior
3) hormones change behaviors, behaviors change hormones
4) hormones has multiple affects, and may be affected by multiple things
5) hormones have pulsatile secretion
6) hormones follow rhythms
7) hormones interact
8) hormones only affect cells with corresponding receptor proteins
neuroendocrine cells
bridge gap between neural activity and endocrine activity - release hormone into bloodstream at synapse
which is faster: neural or hormonal messages
neural
three categories of hormones
peptide, amine, steroid
which hormone is composed of lipids and can pass through phospholipid bilayer?
steroid