Muscle Test Review

Functions of the muscle system includes all except:

• Immunity

• Heat production

• Body movement

• Stabilize joints

Which thin filament protein bind to Ca during muscle contraction?

• Actin

• Myosin

• Troponin

• Tropomyosin

Which muscle characteristic allows the muscle to return to resting length after contraction?

• Contractility

• Excitability

• Extensibility

• Tension

What is the contractile unit of the muscle?

• Z disk

• Sarcomere

• Muscle fiber

• Muscle cell

What protein makes up the thick filaments?

• Troponin

• Tropomyosin

• Myosin

• Actin

What part of the muscle fiber stores Ca ions and releases them when stimulated?

• T tubule

• Sarcolemma

• Nucleus

• Sarcoplasmic reticulum

What is the name of the neurotransmitter that is released from the neuron to the sarcolemma?

• Acetylcholine

• Acetone

• ATP

• Calcium

Which of these occurs last during a muscle contraction?

• The nerve signal reaches the neuromuscular junction

• Ach is released and opens Na ion channels

• The sarcomere shortens

• The myosin binds to the actin

Which of these occurs first during a muscle contraction?

• The nerve signal reaches the neuromuscular junction

• Ach is released and opens Na ion channels

• The sarcomere shortens

• The myosin binds to the actin

The green arrows are pointing at the border between sarcomeres called the.....

• M Line

• H Line

• Z disk

• I Line