Muscles II quiz

What is the contractile unit of muscle tissue?

• Myofibril

• Sarcomere

• Fascicle

• Epimysium

What is the role of ATP in muscle contraction?

• Provides structural support

• Drives contraction and myosin head movement/attachment

• Stores calcium ions

• Transmits electrical signals

The method that generates the most ATP for muscle use is...

• ADP + creatine phosphate stored in muscles

• Anaerobic (oxygen-less) methods such as glycolysis

• Aerobic (oxygen-requiring) methods such as found inside the mitochondria

• None of the above

Tags

NGSS.HS-LS2-3

What is the force generated by the contraction of the muscle called?

• Muscle tension

• Muscle relaxation

• Muscle elongation

• Muscle expansion

In which type of contraction do muscle filaments try to slide but the force is against an immovable object?

• Isotonic

• Isometric

• Concentric

• Eccentric

What happens as more strength is needed during muscle contraction?

• Smaller motor units are activated

• Larger motor units are activated

• Muscle fibers enlarge

• Motor units decrease

Why can't maximum force of contraction last for very long?

• Lack of motor units

• Energy requirements

• Muscle size

• Nerve damage

Tags

NGSS.HS-LS2-3

What is the term for an isolated contraction in muscle fibers?

• Muscle spasm

• Muscle twitch

• Muscle cramp

• Muscle fatigue

During which phase do muscle fibers actively shorten?

• Latent period

• Relaxation phase

• Contraction phase

• Resting phase

What is the role of troponin during the contraction phase?

• It is covering myosin binding sites on thin filaments and must move, opening binding sites up

• It binds to calcium

• It pumps calcium back into the sarcoplasmic reticulum

• It decreases muscle tension