APHY 101: CH.9 Muscle Animations
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25 Terms
A bundle of muscle fibers is known as a
Fascicle
he I-band of a sarcomere is widest when a muscle is relaxed.
True
An action potential enters a muscle cell at the...
T-tubule
An action potential for a muscle cell is propagated along the...
Sacrolemma
The actin-myosin bond is broken by the attachment of...
ATP
Myofibrils are composed of protein filaments called actin and myosin.
True
Which connective tissue wrapping separates individual muscle fibers?
endomysoim
The muscle cell membrane is called the...
Sacrolemma
A skeletal muscle fiber (cell) contains a single nucleus.
False
Movement of sodium ions into the muscle cell at the neuromuscular junction causes..
Depolarization of the muscle cell membrane
Increased calcium ion permeability of the presynaptic terminal cell membrane is caused by an...
action potential
The neurotransmitter at the neuromuscular junction is...
Acetylcholine
Choline formed from the breakdown of acetylcholine in the synaptic cleft is...
Resorbed by the presynaptic terminal membrane
The neurotransmitter at the neuromuscular junction increases permeability of the muscle cell membrane to...
Sodium ions
Which region of the sarcomere does not change length between muscle relaxation and muscle contraction?
A Band
In a fully contracted sarcomere, the H zone...
Disappears
The area between two Z discs is termed a...
Sacromere
In a fully contracted sarcomere, the actin myofilaments...
overlap
Uncovering binding sites for myosin on actin myofilaments is involves troponin binding to...
Calcium ion
Calcium ions released from the sarcoplasmic reticulum enter the...
Sacroplasm
Cross bridges form between binding sites on actin myofilaments and...
Myosin heads
What is released when myosin heads attach to actin filaments?
Phosphate
Energy produced when ATP is converted to ADP and phostphate is stored in...
Myosin heads
During muscle contraction, calcium ions bind to...
Troponin
During muscle contraction, binding sites for myosin are uncovered by the movement of...
Tropomyosin