Muscle Unit Test Review

Which thin filament protein bind to Ca during muscle contraction?

• Actin

• Myosin

• Troponin

• Tropomyosin

Click all that apply. Which of these make up a motor unit?

• Motor neuron

• Motor fiber

• Muscle

• Nerve

The staircase phenomenon: increased muscle contraction, increased strength over time

• Treppe

• Tetanus

• Muscle Energy

• Metabolism

Which muscle contraction results from a high amount of Ca still remaining in the muscle

• Treppe

• Tetanus

• Muscle Energy

• Metabolism

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

Tags

NGSS.MS-LS1-2

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