Muscle Physiology & Bone Structure/Function

Which type of muscle is voluntary and has striations?

• Smooth muscle

• Cardiac muscle

• Skeletal muscle

• None of the above

Where can smooth muscle primarily be found?

• Attached to bones

• In the walls of internal organs

• In the heart

• In tendons

What is the main function of cardiac muscle?

• Movement of the skeleton

• Digestion

• Pumping blood

• Breathing

What is a sarcomere, and how does it relate to a muscle fiber?

• It is a protein that blocks the interaction between actin and myosin.

• It is the smallest functional unit of a muscle fiber, responsible for contraction.

• It is a membrane that surrounds the muscle fiber and provides structural support.

• It is the fluid-filled space where calcium is stored for muscle contraction.

What happens to actin and myosin during muscle contraction?

• They break apart

• Myosin pulls actin to shorten the sarcomere

• Actin binds calcium

• Myosin detaches permanently

Why is ATP important for muscle contraction?

• It powers the movement of myosin heads

• It binds to actin

• It breaks calcium bonds

• It lengthens sarcomeres

Tags

NGSS.HS-LS1-1

What does calcium do during muscle contraction?

• It binds to actin

• It exposes binding sites on actin by interacting with troponin

• It causes the myosin head to detach

• It lengthens the I-band

Which term refers to the immovable attachment of a muscle?

• Insertion

• Origin

• Tendon

• Fascicle

During muscle contraction, what happens to the sarcomere?

• It stays the same length

• It shortens as actin and myosin filaments slide past each other

• It lengthens

• It detaches from the Z-line

Which bone type includes the femur?

• Flat

• Long

• Irregular

• Short