Examlex
Which of the following is not among the countries with the largest areas of old-growth forests?
Sarcomeres
The basic contractile unit of muscle fiber, consisting of actin and myosin filaments between two Z-lines.
Myofilaments
Protein filaments consisting of actin and myosin that are the primary components of muscle contraction.
Acetylcholine
A neurotransmitter in both the central and peripheral nervous systems that plays key roles in arousal, attention, memory, and muscle activation.
Neuromuscular Junction
A specialized synapse between a motor neuron and a muscle fiber, through which signals are transmitted to initiate muscle contraction.
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