Chapter 9 Flashcards
resting membrane potential
K is inside and negatively charged, NA is outside and positively charged
depolarization
NA channels open, NA goes inside and makes inside positively charged
repolarization
Na channels closed, K leaves, making inside negatively changed
repolarization
Na channels closed, K leaves, making inside negatively changed
Nerve signal arrives
Step 1
muscle fiber releases ACH
Step 2
ACH binds to receptors
Step 3
ligand-gated ion channel opens
Step 4
Action potentials occur
Step 5
action potentials enter T tubules
Step 6
calcium is released
Step 7
calcium binds to troponin
Step 8
complex reveals binding sites
Step 9
The junction between nerve endings and muscle fibers.
Neuromuscular junction
A rope-like organ that transfers information to the central nervous system.
Nerve
The enlargement at the end of an axon that secretes a neurotransmitter.
Synaptic knob
The vesicles in the axon containing neurotransmitters.
synaptic vesicles
A chemical in the neuromuscular junction that aids in stimulating or inhibiting muscle contraction.
neurotransmitter
A channel that opens or closes when a ligand is bound to the receptor site.
ligand-gated ion channel
The difference between the electric charge inside membrane and just outside the membrane.
RMP
A rapid change in membrane voltage.
EPP
A channel that opens or closes when a membrane reaches a certain voltage.
voltage-gated ion channel
The network of tubes and canals in the sarcolemma.
sarcoplasmic reticulum
A rapid change in a cell’s electrical charge that reverses the plasma membrane’s electrical polarity.
action potentials