Which of the following lists the structures from largest to smallest?a. motor unit, muscle, myofibril, muscle fiber, thick and thin filamentsb. muscle, muscle cell, myofibril, muscle fiber, actin and myosinc. muscle cell, thick and thin filaments, sarcomere, myofibrild. muscle, muscle fiber, myofibril, thick and thin filaments

Which of the following lists the structures from largest to smallest?a. motor unit, muscle, myofibril, muscle fiber, thick and thin filamentsb. muscle, muscle cell, myofibril, muscle fiber, actin and myosinc. muscle cell, thick and thin filaments, sarcomere, myofibrild. muscle, muscle fiber, myofibril, thick and thin filaments

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter32: Structural Support And Movement

Section: Chapter Questions

Problem 12SA

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Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
Which component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striations
Which of the following is arranged in order from smallest tolargest?a. Motor unit < sarcomere < muscle cell < actin subunitb. Muscle cell < actin subunit < sarcomere < motor unitc. Actin subunit < sarcomere < muscle cell < motor unitd. Sarcomere < motor unit < actin subunit < muscle cell
A. nerve cell releases neurotransmitter which stimulates the muscle cell: B. calcium is released from sarcoplasmic reticulum and floods sarcoplasm; C. sarcolemma is permeable to sodium allowing sodium to rush into cell; D. myosin forms cross-bridges to pull actin into the center of the sarcomere; E. sarcolemma depolarizes and conducts an action potential Put them in order
Describe the structures listed below: (Fig 12.3, 12.4) Muscle fiber: a muscle cell; Myofibril Thick filaments Thin filaments Sarcoplasmic reticulum (SR) Transverse tubules (T-tubules)
Which of the following is the site of calcium ion storage within muscles? a. T tubules b. sarcoplasmic reticulum c. actin filaments d. myosin filaments
How is the list below to be properly put in order to describe a muscular contraction? 1. Calcium causes exocytotic release of Acetylcholine into the synaptic gap; all this happens at an area called the neuromuscular junction2. ATP is consumed which allows myosin to "pivot" the myosin head, which pulls actin toward it.3. This process is repeated multiple times and is called the "sliding filament theory".4. Myosin filaments perform "crossbridging".5. Calcium is released and circulated throughout the muscle cell6. The brain predicts the action necessary and decides which muscles and how many "motor units" are needed to perform that action.7. Tropomyosin moves to reveal the active site of the F-Actin strand8. Upon reception of a calcium ion, the Troponin complex becomes activated9. Proteins embedded in the Sarcolemma receive enough of the ACH neurotransmitter to generate an electrical impulse.10. The electrical impulse is perpetuated throughout the muscle fiber.11. A nervouse impulse is…
Indicate which of the following are true. Chronically shortened muscles will lose sarcomeres in series in order to maintain ideal amounts of myofilament overlap. Contractile force is proportional to the length of a muscle. Muscle organ contraction is all or nothing. Muscle cells are surrounded by an endomysium. Actin is the thick filament and Z-lines are where the cross-bridges zig-zag to adjacent actin filaments. Muscles with fewer motor units are weaker, i.e., capable of less force. A nerve impulse, calcium, and ATP are necessary for muscle contraction. Tendons attach bones to bones and help to limit the range of motion at joints. Muscle tissue is very dynamic and will respond to chronic stress by becoming stronger (making more myofilaments), chronic contraction by becoming shorter (losing sarcomeres in series), and stretching by becoming longer (adding sarcomeres in series). Myofilaments are actually long strands of proteins.
Which statement or statements describe why depletion of ATP after death leads to rigor mortis? Select all that apply. ATP is required to move tropomyosin back over the active sites of thin filaments. ATP is required for myosin thick filaments to detach from actin thin filaments. ATP is required to pump calcium back into the sarcoplasmic reticulum. ATP is required for the action potential to spread across the sarcolemma.
In the numbered list below, what are they in order from largest to smallest?1. Myofilaments2. Myofibril3. Muscle Fiber4. Fascicle5. Muscle
The Sarcolemma in skeletal muscle is OA. Equivalent to the cell membrane which covers the entire fiber. OB. A Large multi-nucleated array of myofibrils, essentially one large fused cell. OC. Facilitates mechanical and electrical communication between cells. O D. A specialized form of the endoplasmic reticulum adapted for calcium uptake and release. O E. None of the above.
What property do all muscle tissues have in common?a. composed of collagen and elastin filamentsb. under conscious controlc. ability to form a communication networkd. ability to contracte. cells are joined by tight junctions