Exam (elaborations)
bios 252 exam 1 questions and answers by A-plus material
- Course
- Institution
bios 252 exam 1 questions and answers by A-plus material
[Show more]
Seller
Follow
Content preview
bios 252 exam 1 questionsand answers by A-plus
material
skeletal muscle - answer ✅✅- long, thin, cylindrical in shape
- multinucleated
- attached to bone & skin
- voluntary
- striated
cardiac muscle - answer ✅✅- short, fat, branched
- uninucleated
- in heart
- attached to intercalated discs
- involuntary
- striated
smooth muscle - answer ✅✅- in hollow organs
- ininucleated
- involuntary
- lack striations
excitability - answer ✅✅responsiveness to chemical signals, stretch, and electrical
changes across the plasma membrane
conductivity - answer ✅✅local electrical excitation sets off a wave of excitation that
travels along the muscle fiber
contractility - answer ✅✅shortens when stim
extensibility - answer ✅✅capable of being stretched b/w contractions
elasticity - answer ✅✅returns to its original rest length after being stretched
, organization of skeletal muscle - answer ✅✅microfilaments, myofibril, muscle fiber,
muscle fascicle, and skeletal muscle
endomysium - answer ✅✅thin sleeve of loose CT around each fiber
perimysium - answer ✅✅thicker layer of CT that wraps fascicles
fascicles - answer ✅✅bundles of muscle fibers wrapped together
epimysium - answer ✅✅fibrous sheath surrounding entire muscle
what are the components of the sarcomere - answer ✅✅z disc, m line, a band, i band,
zone of overlap, thick filament, thin filament, zone of overlap, sarcomere
z disc - answer ✅✅narrow, plate-shaped regions of dense materials that separate on
sarcomere from the next
a band - answer ✅✅dark, middle part of sarcomere that extends entire length of thick
filaments & includes those part of thin filaments that overlap thick filament s
i band - answer ✅✅lighter, less dense area of sarcomere that contains remainder of
thin filaments but no thick filaments
* z disc passes thru center of each I band
h zone - answer ✅✅narrow region in center of each a band that contains thick
filaments but no thin filaments
m line - answer ✅✅region in center of h zone that contains proteins that hold thick
filament together at center of sarcomere
fibrous (F) actin - answer ✅✅2 intertwined strands
- string of globular (G) actin subunits each w/ active site that can bind head of myosin
molecule
troponin molecule - answer ✅✅small, Ca2+- binding protein on each tropomyosin
molecule
1st step of sliding filament theory - answer ✅✅myosin pulls on actin, causing thin
filament to slide inward
* ratchet along filaments
2nd step of sliding filament theory - answer ✅✅z discs move towards each other, &
sarcomere shortens
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 PREJONATO. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.59. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now