3A Physiology of Muscle Contraction Flashcards
responsible for connecting muscle to bone
tendon
fuses at the end of each muscle fiber to form the tendon
sarcolemma
intracellular fluid between myofibrils
sarcoplasm
responsible for the actual muscle contraction
actin and mysoin filaments
causes the alternating light and dark bands
interdigitation of actin and myosin
filamentous protein that acts as a framework holding actin and myosin filaments in place (skeletal)
titin
acts as a spring and changes links as the sarcomere contracts and relaxes (skeletal)
titin
region where actin and myosin overlap
A-band
region that contains the actin filaments
I-band
filamentous protein enclosing the sarcomere
Z-band
wrapped spirally around the actin helix
Tropomyosin
in the resting state, this molecule are on top of the active sites to hinder attraction between actin and myosin
tropomyosin
protein complexes attached along tropomyosin molecules
troponin
3 subunits of troponin and what is it for:
I- affinity for actin
T- for tropomyosin
C- for calcium; strong affinity of troponin C to calcium initiates the contraction process
protruding head and arms of the myosin molecules
cross-bridges
in the resting state of actin, what complex are bound to the active site that prevents contraction
Troponin and Tropomyosin complex
chemical synapse formed between motor neuron and muscle fiber
neuromuscular junction
can be seen in muscle fibers
increases surface area at which synaptic transmitter can act
subneural clefts
carries high energy phosphate bond similar to ATP
phosphocreatine
metabolism for long-term muscle contraction
oxidative metabolism
type of fibres that are used for sustained activities
oxidative red slow fibres (type I) fast fibers (type iiA)
fibres that are used for a short period of time
glycolytic white fast fibres (type IIB)
difference between isotonic and isometric contraction
isotonic - occurs when the force of contraction is greater than the load and tension of the muscle
isometric - occur when the load is greater than the force of muscle contraction
study the comparisons of the action potentials of the different muscle tissues
okeh