Lecture 5 (Membrane Structure & Function Cont...) Flashcards
Where is the Apical Plasma membrane and what is it responsibile for?
Borders with the Lumen outside the cell
Absorbs substances from the Lumen
Regulates nutriant and water intake
protection & secreation
Where is the Lateral membrane located and what is it responsible for?
Locatated between cells (cell contact)
responsible for adhesion to other cells and communication
Where is the basal membrane and what is it responsible for?
it is the opposite side of the apical
cell-substratum contact and generation of ion gradients
What is a major component of internal membrane skeleton and how is it attached?
Spectrin and it is attached to membrane surfaces with ankyrin
What is osmosis? what solution will cells shrink in? swell in?
Diffusion of water through a semipermeable membrane
Cells shrink in hypertonic and swell in hypotonic
What transporter can move solutes in either direction?
Facilitated Difusion
What type of transporter maintains an imbalance of ions?
Active Transport
What is an expample of Coupling transport?
Na+ and K+
3 Na is pumped out of the cell while 2 K are pumped into the cell
What is E1 and E2 conformation?
E1 means the binding sites are avalable for inside the cell while E2 is avalable for outsitde the cell
What is the function of dendrites in neurons?
Receive incoming information
In what direction does K and Na equilibrium drives the resting potential?
K drives it towards negative while Na drives it towards positive
When does depolarization occur?
When Na channels are open
What is an action potential caused by?
The depolarization of a cell
When a pre-synaptic cleft is depolarized, what occurs?
Ca+ channels open, allowing Ca to enter the cell and trigger the release of ACh which then causes Na+ gates to open on the post synaptic cleft
Explain the importance of fluidity to plasma membrane
properties.
▪ Explain how substances move across the cell membrane.
▪ Explain the resting potential, action potential, and
propagation of nerve impulses.
