A&P Muscular System

Smooth muscle has the following characteristic

• striations
• involuntary action
• strong contractions
• many nuclei

Which ion stimulates the binding of actin to myosin?

• potassium
• calcium
• iron
• sodium

Which of the following best describes the role of ATP energy in a muscle contraction?

• It binds actin to myosin.
• It permits inward movement of the Z-lines
• It stimulates the neurotransmitter receptor.
• It blocks the action of calcium.

What type of fibrous connective tissue surrounds the fascicles of muscles?

• endomysium
• perimysium
• epimysium
• famysium

The outermost layer of connective tissue of a
muscle is the:

• fascicle.
• epimysium.
• endomysium.
• perimysium.

• Pectorals
• Rectus Abdominis
• Quadriceps
• Trapezius

What connects skeletal muscle to bone?

• Tendons
• Ligaments
• Z lines
• Blood vessels

A bundle of muscle fibers is called __________.

• Sarcomere
• Fascicle
• Tendon
• Muscle body

The thick myofibril filament of a sarcomere is
composed of a protein:

• actin.
• myosin.
• sarcolemma.
• titin.

The functional contractile unit within muscle fiber is the:

• sarcoplasm.
• sarcolemma.
• sarcomere.
• sarcoplasmic reticulum.