Chapter 11: Myofibers and Skeletal Muscle

What are skeletal muscle cells, or myofibers, referred to due to visual bands of actin and myosin filaments?

• Striated muscle cells

• Cardiac muscle cells

• Smooth muscle cells

• Voluntary muscle cells

What is the smallest functional unit within skeletal muscle cells called?

• Myofibrils

• Sarcomeres

• Filaments

• Myelinated axons

What neurotransmitter is released by the axon onto the myofiber that depolarizes the myofiber's membrane?

• Dopamine

• Serotonin

• Acetylcholine

• Norepinephrine

What is the plasma membrane of a myofiber called?

• Sarcolemma

• Endomysium

• Z-disk

• Synapse

What surrounds individual myofibers?

• Endomysium

• Perimysium

• Epimysium

• Fascia

What is the dense region that separates one sarcomere from another called?

• Z-disk

• A-band

• I-band

• H-zone

What is the long, thin projection from a neuron that delivers a neurotransmitter called?

• Axon

• Dendrite

• Synapse

• Myelin sheath

What type of muscle can only contract with force?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• All types of muscle

What is the union between the axon terminal and myofiber called?

• Synapse

• Neuromuscular junction

• Motor end plate

• All of the above

What is the functional unit within a myofiber composed of?

• Filaments between Z disks

• Thick and thin filaments

• Myofibrils

• All of the above