2.18 Flashcards
1
Q
Neuromodulator
A
A naturally secreted
substance that acts like a neurotransmitter except that it is not restricted to the
synaptic cleft but diffuses through the
extracellular fluid.
2
Q
Peptide
A
A chain of amino acids joined
together by peptide bonds. Most neuromodulators, and some hormones, consist
of peptide molecules
3
Q
Hormone
A
A chemical substance that is
released by an endocrine gland that has
effects on target cells in other organs.
4
Q
Endocrine gland
A
A gland that releases
chemical messengers into the extracellular
fluid around capillaries and hence into the
bloodstream
5
Q
Target cell
A
The type of cell that is directly
affected by a hormone or other chemical
signal
