Cell Membrane & Feedback Quiz Flashcards
Selectively Permeable or Semipermeable:
- Regulates what enters/leaves the cell.
-Separates inside cytoplasm from extracellular
(outside) environment.
-Receives chemical messengers & passes the info to
the cell so it can respond.
PHOSPHOLIPID BILAYER:
– Determines what
molecules can enter &
leave the cell based on
their charge & size.
CHOLESTEROL:
Located b/w the fatty
acids to stabilize &
strengthen the flexible cell
membrane.
Anchor
Proteins:
Anchor
Proteins: keep
cells attached
forming tissues.
Identifier (Cell
Recognition) Proteins:
helps immune system
distinguish “self” vs.
foreign.
▪ Have unique carbohydrate
chains attached!
Enzymatic
Proteins:
Proteins: catalyze
METABOLIC
reactions.
- Active site exposed to
substances in cytoplasm.
Receptor Proteins:
receive
chemical messengers & pass the
info to the cell so it can RESPOND!
Target Cells:
have specifically
shaped receptor proteins for only
certain chemical messengers.
Hormones &
Neurotransmitters:
types of
chemical messengers that bind
to specific receptors in order to
transmit a message.
Channel Proteins:
provides a
hydrophilic channel so charged
substances can cross the
membrane.
Carrier Proteins:
change shape
while shuttling SPECIFICALLY
SHAPED substances across the
membrane.
endocrine system
contains glands that secrete
hormones (chemical messengers) into
the bloodstream.
feedback mechanism
maintains a living system’s
internal conditions within
certain limits and mediates
behaviors, allowing it to
remain alive and functional
even as external conditions
change within some range
positive feedback system
amplifies the initial stimuli
by moving the system
away from its starting state
to achieve a goal.
Ex. childbirth, blood clotting,
negative feedback system
mechanism that counteracts a
disruption in homeostasis to
reestablish internal stability.
