Human Bio Wk 4 Flashcards
Elasticity is the property of muscle that gives
it the ability to stretch without damage.
In an isometric contraction the muscle develops
tension but does not shorten.
Facia/Epimysium - is a band of
connective tissue that surrounds muscles.
When connective tissue extends as a broad flat layer, the tendon is referred to as a
aponeurosis
The contractile filaments of the muscle fiber are
Thick (myosin), Thin (actin).
Which part of the skeletal muscle cell releases calcium when stimulated by the T tubules?
Terminal cisternae
The sarcoplasmic reticulum is used for storing
Ca++
Which of the bands in a myofilament contain only thin filaments?
I Bands.
The signal to excite a muscle cell must cross
the neuromuscular junction by the diffusion of a neurotransmitter [Acetylcholine] across the synapse/synaptic cleft.
Muscles produce ATP from three pathways
a) breakdown of Creatinine phosphate, b) glycolysis also known as anaerobic cellular respiration and c) aerobic cellular respiration.
Creatine phosphate and ATP together create enough energy for a muscle to contract for how long?
2-12 seconds
Rigor mortis occurs because?
As in post-mortem as there is no production of ATP, there is no ATP available to bind to crossbridges and detach the myosin crossbridges.
