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
PHGY 215 Final (Questions & Answers) Rated 100% £6.87
Add to cart
Quickly navigate to
Preview
  2.  
  3. PHGY 215
  4.  
  5. PHGY 215

Exam (elaborations)

PHGY 215 Final (Questions & Answers) Rated 100%
 0 purchase
  • Module
  • PHGY 215
  • Institution
  • PHGY 215

Actin - ️️A globular protein that links into chains, two of which twist helically about each other, forming microfilaments in muscle and other contractile elements in cells The muscle tissue represents the greatest - ️️The greatest tissue mass in the body at around half of the bodys tota...

[Show more]

Preview 2 out of 15  pages

Document information

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

Subjects

  • phgy 215

Written for

  • PHGY 215
  • PHGY 215

Seller

avatar-seller
PatrickKaylian

Reviews received

Content preview

PHGY 215 Final
Actin - ✔️✔️A globular protein that links into chains, two of which twist helically about
each other, forming microfilaments in muscle and other contractile elements in cells
The muscle tissue represents the greatest - ✔️✔️The greatest tissue mass in the body
at around half of the bodys total weight.

Thick filaments (myosin) - ✔️✔️Myosin myofilament with heads that bind to actin by
reaching up and ratcheting forward
About 300/filament

The majority of muscles tissue is - ✔️✔️The majority is skeletal muscle (represents
40% of bw in men and 32% in women)

skeletal muscle - ✔️✔️striated and voluntary

straited - ✔️✔️striped

Level of skeletal muscle organization - ✔️✔️The muscle > muscle fibre > myofibrils >
sacromere

muscle - ✔️✔️tissue composed of fibers that can contract, causing movement of an
organ or part of the body

Muscle fibre - ✔️✔️a single muscle cell. They are much longer than normal cells and
are multinucleate.

Myofibrils - ✔️✔️protein structures that make up muscle fibers

A band - ✔️✔️dark area; extends length of the thick filaments

I band of sarcomere - ✔️✔️the light band between the ends of thick filaments

H zone - ✔️✔️The region at the center of an A band of a sarcomere that is made up of
myosin only. The H zone gets shorter (and may disappear) during muscle contraction.
Slightly lighter portion of A band

M line of sarcomere - ✔️✔️mid-line of sarcomere
Made of proteins that hold thick filaments together

Z line - ✔️✔️A dark thin protein band to which actin filaments are attached in a striated
muscle fiber, marking the boundaries between adjacent sarcomeres.

, Sacromere - ✔️✔️Basic contracting unit of muscle cell consits of actin and myosin
filaments between z-lines in a muscle cell

Muscle cross bridge - ✔️✔️Connection formed when mobile myosin heads bind to actin
molecules in muscles


Myosin - ✔️✔️The contractile protein that makes up the thick filaments of muscle fibers
Dimer of two subunits that looks like a golf club in that it has a long shaft with a globular
head

Thin filaments (actin) - ✔️✔️Made up of proteins actin, tropomyosin, troponin. The
main structural component is two actin filaments.

Tropomyosin - ✔️✔️Thin double helix protein that lies end to end along the actin helix
structure. Regulatory protein that covers the actin binding sites preventing interaction of
actin and myosin

Troponin - ✔️✔️Regulatory protein complex made up of 3 polypeptides. 1 binds
tropomyosin, 1 binds actin, 1 binds Ca 2+

muscle contraction - ✔️✔️The activation of tension generating sites within muscle
fibres when a muscle contracts it shortens

sliding filament mechanism - ✔️✔️Thin filaments slide over thick filaments, by the z
discs pulling together. The I band and H zone shorten, and the A band remains the
same length

concentric contraction - ✔️✔️muscle shortens

power stroke - ✔️✔️action of myosin pulling actin inward (toward the M line)

cross bridge cycle - ✔️✔️sequence of events between binding of a cross-bridge to
actin, its release, and reattachment during muscle contraction
1) binding 2) power stroke 3) detachment 4) binding

sacroplasmic reticulum - ✔️✔️specialized smooth endoplasmic reticulum, releases
calcium on demand when the muscle fiber is stimulated to contract
Runs parallel to the fibres. The lateral sacs of the SR are in close proximity to the T-
tubules. Storage sites for Ca +2

T tubules - ✔️✔️invaginations of the sarcolemma. At the junction of A & I bands, t-
tubules dip into the fibre and run perpendicular to the fibres

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 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 PatrickKaylian. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £6.87. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69052 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now

Start selling
£6.87
  • (0)
Add to cart
Added