Skeletal Muscle
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This lecture was given by Dr. Fitzovitz. It is on skeletal muscle. I will try to alter it later to incorporate information from the book.
- 1.Troponin and Tropomyosin wrap around which filament?
- A.
Actin
- B.
Myosin
- 2.In the relaxed state tropomyosin covers the binding site for actin or myosin
- A.
Actin
- B.
Myosin
- 3.What is myosin considered as being?
- A.
Structural
- B.
Mechanical
- C.
Enzyme
- 4.Sarcomeres are the basic functional unit for which type of muscle?
- A.
Skeletal
- B.
Cardiac
- C.
Smooth
- 5.The distance between what lines compose the sarcomere?
- A.
I bands
- B.
A bands
- C.
Z lines
- D.
H zones
- 6.Innervated by alpha motor neurons and produce force of contraction
- A.
Extrafusal fibers
- B.
Sensors
- C.
Intrafusal fibers
- 7.The distance from one part of a sarcomere to the same part of the next sarcomere
- A.
A band
- B.
I band
- C.
Z line
- D.
H zone
- 8.Regulate sensors and is innervated gamma motor neurons
- A.
Extrafusal fibers
- B.
Sensors
- C.
Intrafusal fibers
- 9.The entire length of the myosin filaments is known as
- A.
I band
- B.
H zone
- C.
A band
- D.
Z line
- 10.Contractile machinery is activated by a rise in...
- A.
Calcium
- B.
Magnesium
- C.
Potassium
- D.
Sodium
- 11.What terminates the contraction?
- A.
Diffusion of calcium from cells
- B.
The coupling of calcium and sodium
- C.
Transport of calcium back into the SR
- D.
An influx of more calcium
- 12.Produced as result of force generated by making & breaking crossbridges
- A.
Passive tension
- B.
Active tension
- C.
Metabolic energy
- D.
Velocity
- 13.What is required for active force?
- A.
Calcium pulse
- B.
Release of calcium from SR
- C.
Transport of calcium back into the SR
- D.
Extracellular fluid calcium
- 14.Causes flaccid paralysis
- A.
Hypercalcemia
- B.
Hypocalcemia
- 15.Causes spasms
- A.
Hypercalcemia
- B.
Hypocalcemia
- 16.In hypercalcemia extracellular calcium can block Na channels preventing action potentials. This leads to flaccid paralysis.
- A.
True
- B.
False
- 17.Is it the ATP binding that breaks cross bridges?
- A.
Yes
- B.
No
- 18.The activity of myosin ATPase limits
- A.
Power
- B.
Velocity
- C.
Work
- D.
Tension
- 19.The best measurement of preload is?
- A.
Passive tension
- B.
Sarcomere length
- C.
Effort
- D.
Active tension
- 20.Check all that apply for isotonic contraction
- A.
No change of force
- B.
Tension does not increase
- C.
Tension does increase
- D.
Length decreases
- 21.Fibers for endurance!
- A.
Type I
- B.
Type II
- 22.Holding a heavy load uses less energy than repetitive drumming. True or false
- A.
True
- B.
False
- 23.Ways to regulate force...
- A.
Preload
- B.
Afterload
- C.
Frequency
- D.
Recruitment
- 24.This way to regulate the force is not available for the heart
- A.
Preload
- B.
Afterload
- C.
Frequency
- D.
Recruitment
- 25.Mechanism that provides ATP for contraction
- A.
Direct phosphorylation
- B.
Glucose
- C.
Oxidation of fatty acids
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