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SLCC Physiology Exam 3 (Ch. 12-16) Questions With Complete Solutions
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SLCC Physiology Exam 3 (Ch. 12-16) Questions With Complete Solutions I band one end of myosin in one sarcomere, only overlap of actin, no myosin myosin thick filaments. shortens both sides of myofibril, pulls actin toward M line, decreases H zone, shortens I band actin thin filaments. made of...

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  • October 13, 2024
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  • 2024/2025
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SLCC Physiology Exam 3 (Ch. 12-16)
Questions With Complete Solutions

I band one end of myosin in one sarcomere, only overlap of actin, no myosin




myosin thick filaments. shortens both sides of myofibril, pulls actin toward M line,

decreases H zone, shortens I band




actin thin filaments. made of subunits, has myosin binding sites




tropomyosin controlled by actin, long filament, when muscle is relaxed, covers binding

sites of actin




troponin changes shape when Ca binds to it. pulls tropomyosin from binding sites and

exposes actin binding sites. controlls tropomyosin




Ca controls ___________ contraction




titin acts like anchor to anchor myosin to z lines on both sides

, SLCC Physiology Exam 3 (Ch. 12-16)
Questions With Complete Solutions
sliding filament model The idea that muscle contraction is based on the movement of thin

(actin) filaments along thick (myosin) filaments, shortening the sarcomere




Cross-bridge cycle myosin grabs actin, pulls actin toward cent of sarcomere (towards m

line), ATP provides energy to detach myosin head and cock it back to original shape, process

repeats.

No calcium- no contraction

No ATP- no release




excitation-contraction coupling of skeletal muscle -depolarization of sarcolemma

(excitation)

-depolarization of T-tubule

-DHP receptors in membrane respond to voltage change

-release of calcium from sarcoplasmic reticulum

-calcium binds to troponin which moves topomyosin away from the binding sites

-cross bridge cycle (contraction of muscle)




Does skeletal muscle have pacemaker cells? No

, SLCC Physiology Exam 3 (Ch. 12-16)
Questions With Complete Solutions

termination of contraction calcium gets pumped quickly back into SR, stops sending

signal




isometric and isotonic twitches ...




summation and tetanus 1. summation is where muscle contractions combine and become

stronger and more prolonged

2. tetatnus is the continous sustained contraction where muscle cannot relax. will release if

maintained.




fiber diameter increased diameter --> increased myofibrils in parallel --> increased force

production




length and tension Max length that skeletal muscle can be stretched (stretched too far it

loses the ability to contract b/c actin and myosin heads are too far to bind)




motor units a single motor neuron and all muscle fibers innervated by it

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