7 Questions
What is primarily affected by Duchenne muscular dystrophy (DMD) due to its inheritance as an X-linked recessive trait?
Boys
What is the membranous smooth ER in skeletal muscle fibers known as in this context?
Sarcoplasmic reticulum
What triggers the release of calcium from the cisternae of the sarcoplasmic reticulum in skeletal muscle fibers?
Membrane depolarization produced by a motor nerve
What is responsible for producing uniform contraction of all myofibrils in a muscle fiber?
Transverse or T-tubules
True or False: In skeletal muscle fibers, the lengths of actin and myosin filaments change during contraction.
False
What happens to the H band during muscle contraction?
It narrows
What is the complex formation of a T-tubule with two terminal cisternae of sarcoplasmic reticulum known as in longitudinal TEM sections?
Triad
Test your knowledge on the structure and composition of sarcomeres, the basic units of myofibrils. Learn about the arrangement of thick and thin myofilaments, the A and I banding pattern, and the components of the dark A band, light H band, and M line.
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