Quiz Info Exam 2 Prep Flashcards
Role of sacroplasmic reticulum ca2+ ATPase (SERCA)
As soon as calcium flows into sarcoplasm from SR, SERCA begins pumping calcium back into SR against gradient
What leads to stop in muscle contraction and muscle relaxation
SERCA
A bundle of muscle fascicles
Whole muscle
Intracellular storehouse of calcium ions
SR
Contracting subunits that make up each myofibril
Sacromeres
A bundle of muscle fibers
Muscle fascicle
Contractile assembly of proteins in a muscle cell
Myofibirl
In the presynaptic terminal of a neuromuscular junction there’s what…
Somatic motor neuron, clusters of synaptic end bulbs, contains ach
Which property was of slow twitch muscles exceeds the performance of fast twitch muscles
Endurance
Slow myosin ATPase is better for
Endurance exercise, for long periods of time
Slow twitch muscles have what diameter
Small
Do slow twitch or fast twitch muscles stores more glycogen
Fast twitch
Structural feature of sacromere that serves as an anchor to actin thin filament or edges of sacromere
Z line or disc
Which factor determines the amount of tension generated by a single motor unit
Number of muscle fibers that have synapses with the motor neuron
Each motor unit has how many motor neurons
1
To counter the perceived length change reported by muscle spindles, the quad…
Activated to contract
Reflex actions don’t require
Higher centers of motor control
What membrane protein facilitates muscle relaxation by returning calcium into SR
Ca ATPase
Calcium release channel
RyR
Open flow occurs down calcium concentration gradient, calcium flowing out of SR through which membrane protein
RyR
Facilitates muscle activation by opening the calcium release channel
DHP membrane protein
is the DHPR involved in muscle relaxation
No
What causes the detachment of myosin from actin at the end of the cross-bridge power stroke
Binding atp
Without conformational change that atp binding causes myosin would
Remain tightly associated with actin (rigor mortis)