100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
BIO 446L Exam 2 Practice Questions and Correct Answers CA$12.98   Add to cart
Quickly navigate to
Preview
  2.  
  3. BIO 446
  4.  
  5. BIO 446

Exam (elaborations)

BIO 446L Exam 2 Practice Questions and Correct Answers
 6 views  0 purchase
  • Course
  • BIO 446
  • Institution
  • BIO 446

Skeletal Muscle Development 1. Come from mesenchymal cells to form myoblasts 2. Myoblasts fuse to form the the myotuble 3. Myotuble differentiates to form muscle fibers -Remaining myoblasts form satellite cells- allow for limited regeneration Skeletal Muscle -striated -multinucleated -peripherally...

[Show more]

Preview 2 out of 5  pages

Document information

  • August 15, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • bio 446l exam 2 practice questions and correct ans
  • skeletal muscle development 1 come from mesenchy
  • skeletal muscle striated multinucleated periph

Written for

  • BIO 446
  • BIO 446

Seller

avatar-seller
twishfrancis

Reviews received

Content preview

BIO 446L Exam 2 Practice Questions and
Correct Answers
Skeletal Muscle Development ✅1. Come from mesenchymal cells to form myoblasts
2. Myoblasts fuse to form the the myotuble
3. Myotuble differentiates to form muscle fibers
-Remaining myoblasts form satellite cells- allow for limited regeneration

Skeletal Muscle ✅-striated
-multinucleated
-peripherally located nuclei
-limited regeneration
-neuromotor units-single axons and all connecting nerve fibers

Endomysium ✅Thin delicate layer of reticular fibers and fibroblasts
Surrounds and supports each muscle cell

Perimysium ✅-Connective tissue that surrounds bundles of muscles cells= fasicles
-contain large blood vessels

Epimysium ✅Surrounds entire muscle

Organization of skeletal muscles ✅Made of
1. Myosin-thick filament
2. Actin- thin filament


Sarcomere ✅-Produce banding pattern in skeletal muscle
-Functional unit of muscle
-the segment of myofibrils between 2 z-lines
-contains myosin filament

How contraction happens ✅Actin attaches to Z-line and on the other side there's actin
which is a continuation of the sarcomere. When the muscle contacts the Z-line moves
toward A- band and actin overlaps the mysoin which causes the muscle to contract.

T-tuble ✅T-tubule and cisternae allow for signal to transmit to muscle
-invaginations of plasma membrane allow for uniform contraction
-triad= t-tubule and 2 terminal cisternae

Communication between neurons and muscles ✅-neurons communicate via synapse-
interellular junction between a neron and another cell
Classifed by type of junction

, -axodendritic- between axon and dendrite of another cell
-axosomatic- between axon and cell body of another cell

Membrane Specialization ✅-Presynaptic bulb- terminal axonal ending
-Synaptic cleft- narrow inter-cellular space
-Post synaptic membrane- receptor

Neurotransmitter in muscles= acetylcholine

Inhibitory vs excitatory synapse ✅Inhibitory- makes post synaptic channel more
difficult to open
excitatory- causes post synaptic channel to open

M.A. of myasthenia gravis acetylcholine esterase ✅Autoimmune disorder that causes
repectors of acetyl choline to be blocked
-causes muscle weakness

Mechanism of contraction ✅1. Nerve impulse triggers release of AcH from synaptic
knob to synaptic cleft. AcH binds to receptors in MEP intiation an impulse in
sarcolemma
2. Ca2+ ions released from terminal cisternae to sarcoplasm
3. Ca2+ binds to tropomyosin on actin to expose active site where myosin binds to form
a cross bridge
4. Myosin head pivots moving filament toward sarcomere center. ATP binds and returns
it to the original position. Muscles shorten because of sliding of thick and then fialments
5. When impulse stops so does flow of Ca2+ ions and return to relaxed position.

Motor Unit ✅single axon and all the the fibers it innervates

Type I ✅slow red oxidative fibers
-slow twitch fatigue resistant
-need lots of blood
-last a long time

Type II a ✅Fast-intermediate oxidative glycolytic fibers
-fast twitch fatigue resistant
-uses glycogen for energy

Type II b ✅-white glycolytic fibers
-fast-twitch fatigue prone

Cardiac Muscle ✅-Post mitotic (don't divide)
-Formed by intercalcated discs which attach cells together and allow for communication
b/t cells via gap junctions
-No satellite cells

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 twishfrancis. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$12.98. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

75323 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
CA$12.98
  • (0)
  Add to cart