Week 4: Muscle Structure and Function Flashcards
muscle producing movement
agonist
muscle for ankle dorsiflexion
tibialis anterior
muscle for plantarflexion
gastrocnemius
muscle for knee extension
quadriceps
muscle for knee flexion
hamstrings
ability of the muscle to go back to its original resting length
elasticity
component of the reflex arc that interprets the signals
CNS
functional unit of the muscle
sarcomere
which one can produce greater tension or force?
quadriceps or biceps brachii
quadriceps = has greater diameter
which one can produce greater tension or force?
eccentric concentric isometric
eccentric
thin filaments of the muscle are composed by:
a. actin
b. troponin
c. tropomysin
d. all of the above
d.
binding of myosin heads to active sites of actin
cross bridge formation
storage of calcium in the muscle
sarcoplasmic reticulum
which one can produce greater tension or force?
gluteus maximus or sartorius
gluteus maximus
which one can produce greater tension or force?
muscle at full elbow flexion or muscle at 90 deg of elbow flexion
muscle at 90 deg of elbow flexion
which one can produce greater tension or force?
type 1 muscle fibers or type 2 muscle fibers
type 2 muscle fibers = responsible for movement such as quadriceps, hamstrings
receptors in the muscle that are sensitive to stretch
muscle spindle
receptors in the muscle that are sensitive to tension
golgi tendon organ
muscle do not change in length
isometric contraction
muscle changes in length
isotonic contraction
more speed, less tension
concentric contraction
more speed, more tension
eccentric contraction
force output from greatest to least
eccentric, isometric, concentric contraction
high resistance to fatigue
type 1 fibers
used in anaerobic
type 2 fibers
slow contraction time
type 1 fibers
stretch reflex which activates agonist
reciprocal inhibition
enough tension triggers GTOs which tell muscles to stop to relax the muscle
autogenic inhibition
ability of a muscle to shorten with force
contractility