Exam (elaborations)
BIO 151 - MUSCLE PHYSIOLOGY FINAL EXAM ACCURATE QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
- Course
- Institution
BIO 151 - MUSCLE PHYSIOLOGY FINAL EXAM ACCURATE QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
[Show more]
Seller
Follow
Content preview
BIO 151 - MUSCLE PHYSIOLOGY FINAL EXAM ACCURATE QUESTIONS AND ANSWERS WITH SOLUTIONS 2024 Be sure that you're comfortable using the names of structures associated with skeletal muscle structure and function. This includes (but is not limited to): myofibril, myofilament, sarcolemma, T -tubule, sarcoplasmic reticulum and terminal cisternae, plus t he components of the sarcomere (especially actin, myosin, troponin, tropomyosin, Z -discs, H zone, A band, I band, and the "zone of overlap"). - ANSWER Myofibril: perform muscle cpntraction Myofilament: Actin and myosin in the muscle Sarcolemma: specialized membrane which surrounds striated muscle fiber cells. (acts as a barrier) T-tubule: Help spread action potential Sarcoplasmic reticulum: stores calcium terminal cisternae: store calcium sarcomere: The structural and functional units of a myofibril actin: allows for attachment of myosin heads myosin: the heads form cross bridges with the actin, looks like a golf club troponin: prevents myosin from binding to actin in relaxed muscle. Tropomyosin: blocks the attachment site for the myosin cross bridge, thus preventing contraction. Z disc: separate one sarcomere from the next H zone: area of only thick filaments A band: middle area in the sarcomere where thick and thin filaments are found. I band: lighter, contains thin filaments but no thick filaments Zone of overlap: thin filaments and thick filaments occupy the same area Describe the events in excitation -contraction coupling: o This is the sequence of events from the arrival of the action potential in the axon terminal of the motor neuron up to the shortening of the sarcomere - ANSWER Once the postsynaptic membrane (muscle cell membrane - sarcolemma) gets depolarized, an action potential is produced in the muscle fiber • This AP (produced at the NMJ) spreads along the membrane, including down along the T -tubules • Depolarization of the T -tubules causes voltage -gated Ca2+ channels in the sarcoplasmic reticulum to open, allowing Ca2+ to cross the membrane of the SR • Ca2+ can then diffuse out of the SR (especially at the terminal cisternae) into the sarcoplasm • Once Ca2+ ions enter the sarcoplasm, they bind totroponin, causing a shape change • This change allows the troponin -tropomyosin complex to move, exposing the active sites on the G actin molecules • The heads of the myosin myofilaments are now able to bind to the G actin active site, forming cross -bridges (when myosin and actin bind)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ACCURATE2. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75057 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now