Endocrine System

paracrine signaling

a chemical messenger is released into the interstitial space and has an effect on a neighbouring cell

autocrine signaling

a chemical messenger is released into the interstitial space and has an effect on the cell that released it

endocrine or hormonal signaling

a chemical messenger is released into the blood and has an effect on a cell at a different site

hormone

a chemical messenger released into the blood that has an effect on a different site

negative feedback loop

a hormone acts to inhibit its own production

positive feedback loop

a hormone acts to stimulate its own production

neurotransmitter

chemical messengers secreted by neurons to have an effect on a neighbouring neuron

target

any cell bearing a receptor for a hormone is a target for that hormone

hormones are released by

endocrine glands, endocrine organs, other organs and tissues

cells can have receptors for more than one hormone

true

hormones can have more than one target

true

How does the hypothalamus regulate production of hormones by the ANTERIOR pituitary gland?

by secreting hormones into the hypothalamo-pituitary portal system

what hormone would be elevated in the peripheral blood of a person who is hypothyroid?

TSH

what hormone would be elevated in the peripheral blood of a person who has primary hypogonadism?

LH and FSH

how is hormone secretion regulated to maintain homeostasis?

negative feedback