Pathophysiology Question Review Flashcards
Inhibitory post synaptic potentials are caused by an influx of
Chloride Cl-
During the power stroke in muscle contraction, what is released from myosin to pull the actin
Inorganic phosphate pi
Action potential can be triggers in a relative refractory period if
The stimulus is stronger than normal
For every three sodium ions pumped out
2 potassium ions are pumped in
A plateau in the cardiac myocyte occurs in phase 2 due to
Simultaneous K+ exit and Ca2+ entry
Temporal summation is
Multiple impulses at one location close together
Dendrites serve to
Receive signals from other cells
A motor neuron and muscle fiber are joined at
The neuromuscular junction
Acetylcholine release causes what at the neuromuscular junction
Depolarization of the muscle membrane
M lines of muscle are
The central line the connect thick myosin filaments
ATP is needed in the sodium potassium pump because
It transports against the gradient
Action potentials
Either happen in totality or not at all
The myelin sheath
Increased action potential speed
The SERCA pump
Transports Ca2+ into the sarcoplasmic reticulum
Nicotine’s receptors on the post synaptic membrane of the motor plate are called what
Ligand gated channels
What allows for pacemaker cells to pace themselves?
Automaticity
The AV node
Delays signal transmission between the atria and ventricles
What type of muscle has spindle shaped fibers with one nucleus
Smooth muscle
The ion responsible for depolarizing membranes during the rise of action potential
Sodium
Endomysium
Surrounds individual muscle fibers
Action potential begins where
At the axon hillock
True or false: an action potential will either occur fully or not at all
True
What structure in muscle cells allows action potential to travel in deep
T tubules
