45.1 hormones and signaling molecules Flashcards
1
Q
hormone
A
molecule secreted into extracellular fluid to send messages throughout body
2
Q
nervous system
A
neurons transmit signals everywhere
3
Q
endocrine glands vs
exocrine gands
A
endo=secrete hormones into surrounding fluid
exo=secrete substances onto body surfaces and body cavities
4
Q
local regulators
A
secreted molecules that act short distance
-reach target only by diffusion
5
Q
paracrine
A
target is near cell
6
Q
autocrine
A
secreted molecules act on secreting cell itself
7
Q
neurotransmitters
A
chemicals that diffuse short distances to target cell receptors
8
Q
neuroendocrine signaling
A
neurosecretory cells (brain) secrete molecules that diffuse from nerve cell endings into bloodstream to reach target cells
- -neurohormones
ex. ADH for kidneys for water balance
9
Q
pheromones
A
chemicals released into the external environment
