Unit 5 Muscular System Review

Two proteins needed for muscle contraction in the human body are (a)   and (b)   .

• tropin & tropymosin
• actin $ Calcium
• actin & myosin
• ATP & Calcium

What do we call the simplest part of a muscle that is made up of tiny, parallel threads called?

• sarcomere

• myofibril

• perimysium

• Epimysium

Your muscle fibers form large, string like bundles called?

• Epimysium

• perimysium

• Myofibril

• Fascicles

What are the two components that are needed to begin contraction?

• Acytelcholine and Actin

• Acytelcholine and myosin

• ATP and Calcium ions

• ATP and Sodium ions

Where are the actin and myosin filaments in every one of your muscle fibers located?

• endomysium

• perimysium

• Epimysium

• Sarcomere

Match the following terms with their role in the initiation of muscle contraction.

• The thick filament that binds to actin to generate force.

• Calcium

• The electrical signal that triggers the release of calcium in muscle fibers.

• myosin

• The ion released from the sarcoplasmic reticulum that enables contraction.

• actin

• The thin filament that interacts with myosin during contraction.

• Action Potential by a motor neuron.

The following list of words includes the function of muscles: (a)  

• movement, heat production, po
• movement, heat production, po
• movement, blood formation, he
• none of the above

The muscle attachment, where the muscle does not move when it contracts, is called (a)   .

• attachment
• insertion
• origin
• none of the above

Name the structure labeled #1 in diagram.

• endomysium

• epimysium

• perimysium

• myofibril

Name the structure labeled #5 in diagram.

• endomysium

• epimysium

• perimysium

• myofibril