human being Anatomy and Physiology assist » solution Physiology » Musculoskeletal Physiology » Muscle Physiology » aid with Sarcomere Physiology

An investigational drug avoids skeletal muscle convulsion by preventing ATP hydrolysis in ~ the active site in muscle tissue. Wherein is this medicine most likely to act?


Explanation:

ATP binding to myosin head regions and also is hydrolyzed to ADP and also inorganic phosphate as soon as muscle relaxes. The release of these products permits the convulsion to occur as the myosin head changes position. The binding of new ATP release the myosin head from actin, and allows the muscle to relax prior to an additional round that hydrolysis. This describes why, in the absence of adequate ATP, muscle deserve to remain in a contract state. This phenomenon, when seen in the deceased, is dubbed rigor mortis.

You are watching: What happens when a sarcomere shortens


Report one Error

Example question #2 : help With Sarcomere Physiology


Ions are key in mediating muscle contraction. Which of the adhering to structures interacts straight with ion to expose actin binding sites in contracting muscle?


Possible Answers:

Tropomyosin


Troponin


Cross-bridges


Myosin


Myofibrils


Correct answer:

Troponin


Explanation:

Troponin (also referred to as troponin C) is the most straight structure the interacts v ions associated in initiating muscle contractions. As soon as bound to calcium ions, troponin facilitates the motion of tropomyosin away from actin binding sites, permitting myosin to bind and, ultimately, contract. There is no the binding that calcium ions to troponin, the myosin-binding website on actin stays obscured through tropomyosin and also contraction can not occur.


Report one Error

Example question #3 : help With Sarcomere Physiology


Which of the following sarcomere sections does not decrease in length during muscular contraction?


Possible Answers:

None of these portions decrease throughout contraction


I band


H zone


A band


All that these portions decrease throughout contraction


Correct answer:

A band


Explanation:

During muscular contraction, the myosin heads pull the actin filaments toward one another resulting in a to reduce sarcomere. If the i band and H zone will certainly disappear or shorten, the A band length will continue to be unchanged. This is since the A band synchronizes to the full length the the myosin filament, or thick filament. Due to the fact that the myosin filament does no actually change length, the A band continues to be constant.

The i band corresponds to the region of activity that does no overlap through myosin. The length of the actin filament go not readjust during contraction, but the an ar of overlap increases. This outcomes in a to decrease of the non-overlapped i band.

The H zone describes the an ar of myosin the is no overlapped by action. As the an ar of overlap grows, the H ar shrinks.


Report an Error

Example concern #4 : help With Sarcomere Physiology


In excitation-contraction coupling in skeleton muscle, the calcium exit from the smooth endoplasmic reticulum binding to i beg your pardon of the following?


Possible Answers:

Myosin


Actin


Calmodulin


Tropomyosin


Troponin


Correct answer:

Troponin


Explanation:

When calcium is released in muscle cells, it binding to troponin. This binding allows tropomyosin to change its orientation, exposing the myosin-binding web page on actin. Myosin heads deserve to then bind to actin, and contraction deserve to occur.

Calmodulin is a molecule that can bind calcium; however, the plays crucial roles in cabinet signal cascades and is not affiliated in skeletal muscle contraction.


Report one Error

Example question #5 : aid With Sarcomere Physiology


In a muscle cell, the H-zone has __________.


Possible Answers:

Z-discs


thick filaments only


thin filaments only


thick and also thin filaments overlapping


Correct answer:

thick filaments only


Explanation:

The H-zone is an area consisted of of only thick filaments (myosin). The I-band is thin filaments (actin) only, and the A-band is where there are thick and thin filaments. The Z-disc is dividing feature in between sarcomeres and appears as dark currently in electron micrographs. 


Report one Error

Example question #6 : aid With Sarcomere Physiology


During muscle contraction, which band(s) that the sarcomere shorten(s)?


Possible Answers:

The H-band only 


The A-band and also H-band


The I-band only


The H-band and also I-band


The A-band only


Correct answer:

The H-band and also I-band


Explanation:

Muscle contraction results in both the H-band and also I-bands shortening, however the A-band continues to be the same size (A band is Always the same). The Z-band is a revolution structure and doesn"t readjust size.


Report an Error

Example concern #7 : help With Sarcomere Physiology


Where in ~ the sarcomere is myosin contained?


Possible Answers:

Thick filaments


Transverse tubules


Thin filaments


Sarcoplasmic reticulum


Correct answer:

Thick filaments


Explanation:

Thick filaments save myosin. Thick filaments are present in the A tape in the center of the sarcomere. Myosin has six polypeptide chains, including one pair of hefty chains and two pair if irradiate chains. Every myosin molecule has actually two “heads” attached come a solitary “tail.” The myosin heads are capable of ATP hydrolysis and bind ATP and also actin, and also are connected in cross leg formation.


Report an Error

Example question #8 : help With Sarcomere Physiology


Troponin binds through which ion?


Possible Answers:

*



*


*


Correct answer:


Explanation:

Troponin is the regulation protein the permits overcome bridge formation when it binds

*
. Troponin is a complex of three globular proteins. Troponin C (
*
) is the
*
 binding protein, that once bound come
*
, permits the interaction of actin and also myosin via conformational adjust that expose the myosin binding website on actin, and thus muscular contraction.

See more: Lowest Common Multiple Of 15 And 18, What Is The Lcm Of 15 And 18


Report an Error

Example concern #9 : aid With Sarcomere Physiology


Where deserve to you find a ryanodine receptor?


Possible Answers:

Transverse tubules


A band


Sarcoplasmic reticulum


Thick chain


Correct answer:

Sarcoplasmic reticulum


Explanation:

The ryanodine receptor is a calcium channel that is responsible for the release of calcium ions. The is located in the sarcoplasmic reticulum. The release of calcium is a required step in muscle contraction. The ryanodine receptor pumps calcium ion from the intracellular liquid into the inner of the sarcoplasmic reticulum, this process keeps the intracellular calcium ions low and also creates a concentration gradient. 


Report one Error

Example question #10 : aid With Sarcomere Physiology


Muscle myofibrils room arranged longitudinally into sarcomeres. Which of the following correctly list the limits of a solitary sarcomere?


Possible Answers:

Z line to Z line


Z heat to M line 


M line to H band


Z line to H band


Correct answer:

Z line to Z line


Explanation:

Each myofibril contains interdigitating thick and thin filaments arranged longitudinally in sarcomeres. Repeating units of sarcomeres account because that the distinct banding pattern in striated muscle. A sarcomere operation from Z line to Z line.


Report one Error
← ahead 1 2 following →
*

see Tutors
Judy Certified guardian
Lakeland College, Bachelor in Arts, Accounting. Lakeland College, grasp of Arts, audit and company Management.
see Tutors
Jeffrey Certified tutor
Brigham Young University-Idaho, Bachelor that Science, civil Engineering.
view Tutors
Meg Certified tutor
University that Wisconsin-Milwaukee, Bachelor that Science, French.

All human being Anatomy and also Physiology sources


6 Diagnostic exam 306 exercise Tests concern of the work Flashcards find out by ide
Popular Subjects
computer Science Tutors in Chicago, analysis Tutors in Miami, MCAT Tutors in Miami, Algebra Tutors in Los Angeles, Calculus Tutors in Atlanta, Physics Tutors in Boston, Algebra Tutors in Phoenix, Spanish Tutors in Washington DC, MCAT Tutors in Denver, French Tutors in brand-new York City
Popular process & Classes
ACT courses & classes in Philadelphia, SSAT courses & class in Los Angeles, GRE process & classes in Philadelphia, SSAT courses & great in Boston, Spanish courses & classes in Atlanta, GRE courses & class in Washington DC, ACT courses & great in Miami, MCAT process & class in Phoenix, SAT courses & classes in Denver, LSAT process & great in Boston
Popular check Prep
MCAT check Prep in Atlanta, satellite Test prepare in Chicago, ACT test Prep in Philadelphia, GRE test Prep in Washington DC, ISEE check Prep in mountain Diego, ACT test Prep in Miami, LSAT check Prep in Chicago, GRE test Prep in Chicago, satellite Test prep in Seattle, ISEE test Prep in Seattle
Report an problem with this inquiry

If you"ve uncovered an issue with this question, you re welcome let united state know. Through the assist of the community we can continue to improve our educational resources.


Do no fill in this field
* your Name:
* worry Description:
DMCA complain

your Infringement an alert may it is in forwarded come the party that made the content obtainable or to third parties such as ChillingEffects.org.

you re welcome follow these measures to file a notice:

you must include the following:

Send your complain to our designated certified dealer at:

Charles Cohn Varsity Tutors gmbh 101 S. Hanley Rd, Suite 300 St. Louis, MO 63105