CTL week 7

Question 1

is Acetyl choline inhibitory or excitatory at neuromuscular junctions in skeletal muscle?

Answer 1

is Acetyl choline inhibitory or excitatory at neuromuscular junctions in skeletal muscle?
Answer: Excitatory

Question 2

is Acetyl choline inhibitory or excitatory in cardiac muscle?

Answer 2

is Acetyl choline inhibitory or excitatory in cardiac muscle?
Answer: inhibitory

Question 3

______ one or more presynaptic neurons transmit impulses in rapid-fire order.

Answer 3

__Temporal____ one or more presynaptic neurons transmit impulses in rapid-fire order.

Question 4

______ postsynaptic neuron stimulated simultaneously by multiple inputs at same time.

Answer 4

__Spatial____ postsynaptic neuron stimulated simultaneously by multiple inputs at same time.

Question 5

what is the equilibrium potential for K+

hint: concentration & electrical force of ion produces this

Answer 5

what is the equilibrium potential for K+
Answer: -90 mV
(hint: concentration & electrical force of ion produces this)

Question 6

what is the equilibrium potential for Na+

Answer 6

what is the equilibrium potential for Na+

Answer: +66mV

Question 7

the resting membrane potential is much closer to the Eq for K+ because the membrane is?

Answer 7

the resting membrane potential is much closer to the Eq for K+ because the membrane is?

Answer:
the membrane is more permeable to K+

Question 8

true or false

if permeability to ions changes, then membrane potential also changes.

Answer 8

true or false
if permeability to ions changes, then membrane potential also changes.

Answer: true

Question 9

what are the 3 phase when triggering an action potential?

Answer 9

what are the 3 phase when triggering an action potential?

Answer:
Depolarisation (Na+ channel opens)
Repolarisation (Na+ channel inactivated, K+ channel open. Na+ channels close)
Hyperpolarisation (K+ channel close and passive movement of K+ out and Na+ in)

Question 10

action potentials are due to change i membrane potential which happen because _________ channels open and/or close?

Answer 10

action potentials are due to change i membrane potential which happen because _________ channels open and/or close?

Answer: voltage-gated ion channels open/close