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What is the basic function of all muscle tissue?
generate muscle tension
What characteristic is NOT descriptive of cardiac muscle tissue?
voluntary muscle contractions
The degree to which a muscle cell can stretch depends on its __________.
extensibility
The storage and release of calcium ions is the key function of the __________.
sarcoplasmic reticulum
What anchors thin and elastic filaments in place within the myofibril?
Z disc
Myofilaments shorten to produce muscle contractions according to the sliding filament mechanism.
false
region that contains both thick and thin filaments
A band
middle portion of the A band that contains thick filaments only
H zone
the sarcomere is situated between two of these adjacent structures
Z-disc
region that contains only thin filaments
M line
middle line of the A band
I band
The Na+/K+ pump helps a muscle cell maintain a state of __________.
resting membrane potential
What value best represents resting membrane potential of skeletal muscle cells?
-85 mV
Electrical gradients exist because sodium and potassium ions are separated on either side of the plasma membrane.
true
The synapse of a motor neuron with a muscle fiber is known as the __________.
neuromuscular junction
What is required for excitation-contraction coupling?
calcium ions and ATP
The binding of a myosin head to an actin molecule is termed a __________.
crossbridge
A pathway of ATP production that results in the formation of lactic acid is __________.
glycolytic catabolism
Which statement best describes the function of myoglobin?
Myoglobin stores oxygen in muscle cells.
Through which ATP-generating mechanism can long-lasting muscle contractions be sustained?
oxidative catabolism
