10 Questions
What is the function of the sarcoplasmic reticulum in muscle contraction?
Releasing calcium ions for muscle contraction
What is the name of the cell membrane of a muscle fiber?
Sarcolemma
What are the small projections from the sides of the myosin called?
Cross-bridges
What gives myofibrils their striated appearance?
Interdigitation of myosin and actin filaments
What is the portion of the myofibril that lies between two successive Z discs called?
Sarcomere
What is the main source of energy required for the walk-along mechanism during muscle contraction?
The concentration of ATP in the muscle fiber
What happens to the actin filaments during muscle contraction?
They pull inward among the myosin filaments to their maximum extent
What role does acetylcholine play in muscle excitation?
It binds to the Ach-gated channels and opens the channel
How long can the concentration of ATP in the muscle fiber maintain full contraction?
1 to 2 seconds
What is the function of transverse tubules (T-tubules) during excitation-contraction coupling?
Transmission of action potential to deeper regions of the muscle fiber
Test your knowledge of skeletal and smooth muscle contraction with this quiz. Learn about the composition of skeletal muscles, muscle fibers, and their innervation.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
