Chapter 10 Flashcards
Muscles grow in size via… hypertrophy/hyperplasia?
hypertrophy
Can cardiac muscle cells regenerate?
yes, limitedly under specific conditions
Myosin functions as a motor protein in which types of muscle tissue?
skeletal, cardiac, smooth
Tropomyosin and troponin are __ proteins found in the ___ filaments of muscle fibres.
REGULATORY proteins found in the THIN filaments
Titin is found connecting the _ to the _ to contribute to…
M line to the Z line to contribute to force transmission at the Z line
What is the function of dystrophin?
Links thin filaments to integral membrane proteins in the sarcolemma - thought to reinforce sarcolemma and transmit tension they generate to tendons
The alpha helix is considered the ___ structure level of a protein
secondary (hydrogen bonds)
Creatine phosphate system + ATP provide enough energy for a muscle to maximally contract for __ seconds
15
T/F: lactic acid is continually produced with aerobic cellular respiration in skeletal muscle
false. it’s a waste product of anaerobic respiration
What is the purpose of the stress-relaxation response of smooth muscle?
allows smooth muscle to undergo great changes in length while retaining the ability to contract effectively, without dramatically increasing pressure of contents of the organ
What forms a cross-bridge during muscle contraction?
when myosin on the thick filaments binds to actin on the thin filaments
Leg muscles are predominantly composed of what type of muscle fibre?
fast oxidative-glycolytic (most useful in running, walking)
What is the function of titin?
helping a sarcomere return to its resting length
When/what is the latent period of a muscle contraction?
it is a brief delay between the application of the stimulus and the beginning of a contraction
the muscle Ap sweeps over the sarcolemma and calcium ions are released from the SR
Which type of muscle fibres are the darkest red?
slow oxidative
