Skeletal Muscle Structure Quiz

Which structure in the skeletal muscle slide appears as a dark line running perpendicular to the muscle fibers?

• Myofibril

• Sarcolemma

• Z disc

• Fascicle

• Nucleus

In a cross-sectional view of skeletal muscle, what is the name of the visible connective tissue surrounding individual muscle fibers?

• Epimysium

• Endomysium

• Perimysium

• Myolemma

• Sarcoplasm

Under a microscope, which feature distinguishes skeletal muscle from cardiac muscle?

• Presence of intercalated discs

• Striations with multiple nuclei per fiber

• Central nucleus

• Branched fibers

• No visible striations

What happens at the neuromuscular junction, identifiable by a model of a motor unit?

• Calcium is stored

• Myosin heads bind to actin

• Acetylcholine is released into the synaptic cleft

• ATP is produced

• Sarcomere shortens

Which structure is responsible for carrying the action potential deep into the muscle fiber?

• Sarcoplasmic reticulum

• T-tubule

• Z disc

• Myosin filament

• Synaptic vesicle

When observing a contracted muscle model, which sarcomere region shortens?

• A band

• H zone

• Z line

• Myofibril

• Nucleus

In a neuron slide, which part of the cell typically stains the darkest due to rough ER content?

• Axon hillock

• Axon

• Nissl bodies

• Dendrite

• Synaptic terminal

What is the function of the myelin sheath visible in longitudinal nerve tissue?

• Produces neurotransmitters

• Increases speed of nerve conduction

• Filters blood for the neuron

• Maintains blood-brain barrier

• Transports synaptic vesicles

On a peripheral nerve cross section, what is the name of the outermost connective tissue?

• Epineurium

• Endoneurium

• Perineurium

• Myelin

• Axoplasm

Which part of the neuron receives incoming signals, as seen in neuron models?

• Axon

• Dendrite

• Synapse

• Nissl body

• Node of Ranvier