PART 1 Flashcards
What are the three types of molecules for communication?
-Receptors
-Chemical messengers
-Secondary messengers
Protein molecules that bind ligands and effect some type of change.
Receptors
Also called ligands, interact with receptors. They fit into receptor sites in a manner reminiscent of the lock-and-key model of enzyme action.
Chemical messengers
Carries a message from a receptor to the inside of a cell and amplify the message.
Secondary messengers
What are the key features of HORMONES that differs from Neurotransmitters
- messengers for ENDOCRINE SYSTEM
- transmitted through BLOOD
- distance is FAR from origin
- targets SPECIFIC organ/tissue
- DEPENDANT upon hormonal secretion
- surface receptors are G COUPLED protein receptors
What are the key features of NEUROTRANSMITTERS that differs from hormones
- messengers for NERVOUS SYSTEM
- transmitted through synaptic cleft
- distance is CLOSE from origin
- targets the MEMBRANE OF POST SYNAPTIC CLEFT
- INDEPEDANT. concentration of NT is constant.
- receptors are LIGAND-GATED ION CHANNELS.
A nerve cell.
Neuron
A chemical messenger between a neuron
and another target cell;
a neuron, muscle cell or
cell of a gland.
Neurotransmitter
What happens if we have no chemical neurotransmitters
we would not survive. no coordination
What can a drug affect?
- Messenger
- Receptor
- Secondary Messenger
- Enzyme
An __________ drug blocks a receptor and prevents its stimulation
Antagonist
An _________ drug competes with a natural messenger for a receptor site. Once there it stimulates the receptor.
Agonist
Other drugs ________ the concentration of the messenger by controlling the release of messengers from their storage.
Decrease
Other drugs _________ the concentration of the messenger by inhibiting its removal from the receptors.
Increase
Papasa or Babagsak
PAPASAAAAAAAA!!!!!!
