Properties of Muscles
What is the properties of Contractility?
The ability of our muscles to shorten and generate force.
What does ATP stand for? What does it do?
Adenosine Triphosphate
Attached to the head of the Myosin and a phosphate breaks off to generate energy.
What are the 4 basic muscles that make up the Abdominals?
What are their functions?
Rectus Abdominis: trunk flexion
Internal/External Obliques: trunk rotation
Erector Spinae: trunk extension
Transverse Abdominis: stabilization of trunk
What type of twitch muscles require the least ammount of energy? The most?
Type llb
Type 1
Starts with an ___________ from the brain. ______ reaches a synapse, then _________(neurotransmitter) is produced. Then an ______ ______ is produced to travel along the muscle.
Electrical signal
Signal
Acetylcholine
Action Potential
What is the properties of Extensibility?
The ability to lengthen or stretch.
What is Hugh Huxley's Sliding Filament theory?
as the sarcomere slides, the A bands and I bands slide/stagger over one another with contraction.
What are the 4 basic muscles that make up the rotator cuff?
Functions?
Supraspinatus: External rotation of the arm
Infraspinatus: External rotation of the arm
Subscapularis: Internal rotation of the arm
Teres Minor: External rotation of the arm
What type of sports/ exercise does Type llA muscles work for?
Cycling
(possibly swimming)
What is the "Rope"?
Actin
What property is the ability to return to its original resting length after being stretched?
Elasticity
What is a Sarcomere?
"Z disc to Z disc"
The smallest contraction unit of a myofibril
What two muscles make up the Illiopsoas?
Function
Psoas Major/Minor+Illiacus
Hip flexion
What type of sports/ exercise does Type 1 muscles work for?
Walking and slow jog
What is the "anchor point" or "Glue"?
Troponin
What is the definition of Excitability?
The ability to respond to an electrical signal.
What is the characteristics of Actin? (myofibril)
Actin
I
Light
Thin
What does the semimembrinosus do? What about the Semitendinosus? Whats the physical difference between them?
Both do knee flexion and hip extension
The semimembrinosus starts in the back and stays on the back. And the semitendinosus starts on the back and goes to the front.
Type llB muscles fatigue at a _____ rate and have ____ contraction times.
What type of sports/ exercise does Type llB muscles work for?
high rate
short
Sprinting, jumping, throwing, and weightlifting
What is the "String" wrapped around the "Rope"(Actin)
Tropomyosin
What is the difference between Atrophy and Hypertrophy?
Atrophy: Decrease in size
Hypertrophy: Increase in size
What is the characteristics of Myosin? (myofibril)
Myosin
A
Dark
Thick
What is the function of the tibialis posterior/anterior?
What is its antagonist?
inversion
Peroneus
What muscle type is the most fatigue resistant? Least?
Type 1
Type llB
What "loosens the glue" to allow the Myosin head to reach the Actin and create the rachet movement.
Calcium ions