muscle tissues and models

Endomysium

Connective tissue around each muscle fiber

Sarcolemma

Muscle cell membrane

Sarcoplasm

Cytoplasm of muscle fiber

Nucleus

Contains DNA of muscle cell

Mitochondria

Energy producers

Neuromuscular junction

Point of nerve-muscle contact

Myofibrils

Contractile threads within muscle fibers

Sarcomere

Unit of contraction

A band

Thick filament (myosin) region

M line

Middle of sarcomere

I band

Thin filament (actin) region

Z disc

Anchors thin filaments

Motor neuron

Nerve cell controlling muscle

Axon terminal

End of neuron releasing neurotransmitters

Synaptic vesicles (ACh)

Contain acetylcholine

Synaptic cleft

Space between neuron and muscle

ACh receptors

Receive signals for contraction

Mitochondria

Supply energy for neurotransmission