Muscles Review

What are the three types of muscle?

• Smooth, Hard, Cardiac

• Cardiac, Smooth, Skeletal

• Skeleton, Heart, Bladder

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

• Contractility

• Excitability

• Extensibility

• Tension

What is the name of the plasma membrane surrounding each muscle fiber?

• T Tubule

• Sarcolemma

• Sarcoplasm

• Nucleus

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

• Acetylcholine

• Acetone

• ATP

• Calcium

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

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

What is the energy source that is used for all contractions?

• Glucose

• Creatine

• ATP

• Oxygen

What is not a special characteristic of muscle cells?

• Contractility

• Extensibility

• Excitability

• Agility