WorksheetsPhysiology Review Part 2
Total questions: 25
Worksheet time: 20mins
All of the following are functions controlled by the skeletal muscle EXCEPT?
Movement of the whole body or part of the body
maintain blood pressure and flow
Emptying contents of certain organs to the external environment
Manipulation of external objects
Which is true concerning the structure of skeletal muscle
Have contractile apparatus
Have Muscle fibers
Contain thin and thick filaments
Two of these
None of these
During contractions of the sarcomere what band/zone shortens horizontally?
L- Band
I- Band
H Zone
two of these
The thick filament contains _____ but NOT _____
Sarcomere, Sarcoplasmic Reticulum
Myosin, Actin
Actin, Myosin
Tail, Head
The thin filament contains ____ but NOT_____
Actin, Myosin
Actin, Tropomyosoin
Troponin, Tropmyosin
Myosin, Actin
During Calcium Release, this travels down the T-tubule, and open VG DHP receptors
ACh
(Acetylcholine)
Action potential
Action Nuerons
Calcium
During Calcium Release:
After the AP travels down the T-tubule, triggering the opening of VG DHP receptors what happens?
Ca++ enters the cell through VG Ca++ channels
SR opens, Ca++ enters the cytoplasm
Contraction(Excitation contration coupling)
RR opens, and allows Ca++ to enter the cytoplasm
What is the role of Ca++
create a contraction
Combine with troponin
Move myosin out of the way
None of these
Power Stroke:
1. High energy state(Resting)
2.___________________
3. Phosphate falls off
4._______!!!
5. ___________
6. Cross bridge breaks
7. ________(hint: LE to HE)
2. Cross Bridge Formed
4. Power Stroke
5. ATP Binds to actin
7. Myosin re-energized
2. Cross Bridge formed
4. ATP Binds to myosin
5. Power stroke
7. Actin re-energized
2. Cross Bridge Formed
4. Power Stroke
5. ATP binds to myosin
7. Myosin re-energized
2. Cross Bridge Formed
4. ATP Binds to Myosin
5. Myosin re-energized
6. Power Stroke
During Relaxation what occurs?
ACh is removed
ACh-esterase removes ACh
The muscle relaxes
Troponin and tropomyosin can resume their blocking role
All of these answers are correct
_____ is a weak contraction produced by a single muscle fibers in response to a singular action potential
Tweak
Muscle Contraction
Tetanus
Twitch
This is only innervated by one neuron
Muscle fiber
Motor neuron
Motor unit
Neuron
What is a motor unit?
Multiple neurons innervating Multiple fibers
One fiber innervating multiple neurons
One neuron innervating multiple fibers
Multiple fibers innervating multiple neurons
The strength and the precision of the recruitment of a motor units is dependent on?
strength of motor neuron
Size of the motor unit and number of motor units activated
size of the muscle fiber
Size of of the Action potential
To prevent fatigue during sustained contraction...
Only a portion of the motor unit is being used
Only possibly for sub maximal contraction
two of these
none of these are correct
what factor influence the extent to which tension can be developed?
fatigue
Frequency of stimulation
Thickness of the fiber
All of these
two of these
Which of the following is true about tetanus?
twitch happens but doesn't relax
There is not enough calcium present
The maximal strength is 3-4 time more than a single twitch
There is less calcium present
During greater than optimal length of a muscle fibers what happens
thin filaments are stretched out
Thin filaments overlap
thick filaments have contact with z-line
less Ca++ is released and does not bind
During muscle fatigue what happens
ACh deficiency
accumulation of lactic acid
increase in organic phosphate
Two of these
None of these
During central fatigue what happens
More lactic acid is accumulated
CNS can no longer activate motor neurons
Depletion of energy reserve
increase in inorganic phosphates
Smooth muscle has ________ but no _____ and a poorly developed____
Thick filament, T-tubule, SR
Thin filament, SR, T-tubule
Thick filaments, thin filament, SR
Thin filament, T-tubule, SR
Once myosin is phosphorylated and binds to actin, what happens as normal
Power stoke
Ca++ release
Second messenger system
cAMP
The location(s) of multiunit smooth muscle is/are?
large airways to the lungs
Large blood vessels
skin
Ears
two off these
Single unit smooth muscle is found
Hair follicles
wall of hollow organ
walls of organs
blood vessels
Myogenic muscle cells....
Maintain Vrest
do not maintain a Vrest
act as "pacemaker cells"
Two of these
All of these
