Module 1-3 TBL Questions Flashcards
What is the function of astrocytes?
A) produce myelin
B) remove debris
C) support the BBB
D) sweep CSF through the ventricles
C) support the BBB
Which membrane transport allows ions to leak out of a protein down their conc. gradient?
facilitated diffusion
What type of transmembrane protein responds to a chemical stimulus?
ligand gated
What type of neuron fiber branches off of an axon and maintains the same properties as the axon?
collaterals
Which direction does water move with osmosis?
toward an area with high conc. of solutes
What are nissl bodies?
cytoplasmic stacks of RER
The sodium potassium pump pumps _______ sodium ions out of the cell and ______ potassium ions into the cell each cycle
3, 2
How does myelin protein zero assist in the formation of myelin?
it holds schwann cells together
Which protein transports substances toward the soma?
dynein
What are membrane channel proteins?
structures that allow ions to cross a cell plasma membrane
What is the key to regenerating a transected axon?
aligning the stumps
What structure is unmyelinated, very slender, and is located at the distal end of the axon?
telodendria
Which membrane transport system moves solutes against their conc. gradient?
active transport
What type of extracellular fluid will cause a body cell to swell?
hypotonic
Which cell differentiates to form a tunnel between transected axon stumps?
schwann
Which axoplasmic transport mechanism carries stuff away from the soma?
anterograde
Which vesicular protein plays a role in neurotransmitter release?
vSNARE
What do schwann cells secrete that assist injured neurons in the repair process?
nerve growth factor
Neurotubules are held together by ________ proteins
tau
Which ion is most likely to enter a cell through leaky channels down its chemical gradient?
sodium
Why can a neuron’s membrane respond to multiple rapid fire local responses?
local responses can summate
EPSPs can cause all of the following EXCEPT:
A) move membrane closer to threshold
B) cause hyperpolarization
C) move membrane closer to zero
D) can lead to an action potential
B) cause hyperpolarization
What condition moves the resting membrane potential closer to threshold?
hyperkalemia
What does a sudden increase of calcium ions in the axon terminal cytoplasm stimulate?
neurotransmitter release
Why do cells need to maintain resting membrane potential?
to respond to a stimulus
What molecule effects the efflux of K+ through leaky channels?
AAs