physiology

Question 1

what is TPT?

Answer 1

time to peak tension

Question 2

what is 1/2RT?

Answer 2

time required to relax 1/2 peak tension

Question 3

what is the size principle?

Answer 3

states that smaller motor neuron bodies are the first to get recruited because they require fewer excitatory synapses to reach depolarization threshold

Question 4

describe slow twitch fibers

Answer 4

increased density of mitochondria
increased FA oxidation
decreased chance of fatigue
more capillary blood supply

Question 5

describe fast twitch fibers

Answer 5

more ATP consumption
glycogenolytic
increased chance of fatigue
increased myosin ATPase activity

Question 6

depolarization of the T tubule membrane causes conformation change in the ______________ receptor

Answer 6

dihydropyridine

Question 7

when the AP reaches the nerve terminal it releases ACh via a Ca2+ mediated process and the ACh binds to what kind of receptors on the motor end plate?

Answer 7

nicotinic

Question 8

if enough nicotinic receptors are activated this depolarizes the surrounding membrane and activates what kind of channels leading to an action potential?

Answer 8

Na+ channels