Which choice lists the components of a muscle from the smallest unit to the largest unit? A. myofibril, filament, sarcomere, muscle fiber B. filament, sarcomere, myofibril, muscle fiber C. sarcomere, filament, muscle fiber, myofibril D. muscle fiber, filament, sarcomere, myofibri

Which choice lists the components of a muscle from the smallest unit to the largest unit? A. myofibril, filament, sarcomere, muscle fiber B. filament, sarcomere, myofibril, muscle fiber C. sarcomere, filament, muscle fiber, myofibril D. muscle fiber, filament, sarcomere, myofibri

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter16: The Body's System

Section: Chapter Questions

Problem 22RQ: Which component is responsible for initially stimulating a muscle contraction? a. proteins b....

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Concept explainers

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.

Question

Which choice lists the components of a muscle from the smallest unit to the largest unit?

A.

myofibril, filament, sarcomere, muscle fiber
B.

filament, sarcomere, myofibril, muscle fiber
C.

sarcomere, filament, muscle fiber, myofibril
D.

muscle fiber, filament, sarcomere, myofibril

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What structure on a muscle fiber is composed of largely two varieties of contractile proteins--actin and myosin--which slide past each other during muscle activity to bring about shortening or contraction of muscle cells? A. myofilament B. sarcoplasmic reticulum C. transverse tububle D. sarcomeres
Which is a false statement about skeletal muscle structure?a. A myofibril is composed of multiple muscle fibers.b. Most skeletal muscles attach to bones by connective-tissue tendons.c. Each end of a thick filament is surrounded by six thin filaments.d. A cross-bridge is a portion of the myosin molecule.e. Thin filaments contain actin, tropomyosin, and troponin.
Identtidy which among the list represents the hierarchy of muscle structure from the largest unit to the smallest? A.muscle fiber → myofibril → sarcomere → filaments B.sarcomere → myofibril → filaments → muscle fiber C.muscle fiber → sarcomere → myofibril → filaments D. myofibril → muscle fiber → sarcomere → filaments
Which is most accurate with regard to the phrase "muscle fiber"? A. Muscle fibers technically only refer to actin protein filaments B. muscle fibers are often called "cells" but actually they are many cells fused into a long tubular structure. C. muscle fibers are also called fascicles which are bundles of many muscle cells D. Muscle fibers are the same as myofibril organelles, packed into each cell
What structure in skeletal muscle cells functions in calcium storage? a.myofibrillar network b.sarcoplasmic reticulum c.intermediate filament network d.mitochondria
What do skeletal muscle contractions share in common with smooth muscle contractions?a. Both types of contractions do not require calcium ions for a contraction to occur.b. Both types of contractions generate little force or a weak force.c. Both types of contractions consume very little ATP.d. Both types of contractions result from thick and thin filaments sliding past one another.
Which protein is not part of the thin filament in a muscle fiber? A. Actin B. Myosin C. Tropomyosin D. Troponin
Which statement about striated skeletal muscle is true? A. The tension generated by a muscle is invariable. B. Mechanical summation of twitches in a muscle fiber leads to a graded increase in the tension that is above that generated by a single twitch. C. A single action potential arriving at the neuromuscular junction is not sufficient to cause a muscle fiber to twitch. D. Muscle twitches are able to mechanically sum when Ca2+ is quickly and completely removed from the sarcoplasm between action potentials. E. An action potential in the muscle cell activates contraction by releasing Na+ into the sarcoplasm.
Using what you know about the functional units of muscle, describe the structure of a muscle fiber. List another term for muscle fiber.
Which of the following could prevent skeletal muscle from contracting? Select one or more: a. Preventing calcium from surrounding myofibrils. b. Maintaining high levels of calcium around myofibrils c. Preventing sodium from entering a cell d. Allowing constant entry of sodium into a cell
What is the first and most direct energy source for muscle contraction? a. glucose b. ATP c. creatine phosphate d. glycogen
Predict the appearance of the muscle fibers of an athlete who trains to run marathons. What type of muscle fiber would likely predominate in this person’s muscles?