The Musculoskeletal System

Fill in the blank: Muscle contraction involves the interaction of actin and _______.

• Myosin

• Collagen

• Elastin

• Keratin

Where is the cardiac muscle found?

• In the brain

• In the heart (the chamber walls)

• In the lungs

• In the stomach.

What property of muscle tissue allows it to shorten and generate force?

• A) Elasticity

• B) Contractility

• C) Extensibility

• D) Electrical excitability

Which layer of connective tissue surrounds groups of 10 to 100 or more muscle fibers?

• Endomysium

• Perimysium

• Epimysium

• Fascia

The layer of connective tissue that surrounds individual muscle fibers is known as ________.

• Endomysium

• Perimysium

• Epimysium

• Tendon

What is the term for the alternating light and dark bands seen in skeletal muscle fibers under a microscope?

• Sarcomere

• Myofilament

• Striation

• Perimysium

Fill in the blank: The _______ is the outermost layer that surrounds the entire muscle.

• A) Epimysium

• B) Perimysium

• C) Endomysium

• D) Fascicle

What is the function of the tendon in muscle structure?

• Connects muscle to bone

• Stores calcium

• Produces energy

• Transmits nerve signals.

What are the components of the thin filament in skeletal muscle cells?

• Myosin

• Actin

• Tropomyosin

• Both B and C.

What is the function of mitochondria in muscle cells?

• Store calcium

• Produce energy

• Transmit signals

• Connect fibers.