Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 16, Problem 22RQ
Which component is responsible for initially stimulating a muscle contraction?
a. proteins
b.
c. plasma membranes
d. striations
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Chapter 16 Solutions
Concepts of Biology
Ch. 16 - Figure 16.2 When bacteria are destroyed by...Ch. 16 - Figure 16.7 Which of the following statements...Ch. 16 - Figure 16.9 Which of the following statements...Ch. 16 - Figure 16.10 Which of the following statements...Ch. 16 - Figure 16.14 Goiter, a disease caused by iodine...Ch. 16 - When faced with a sudden drop in environmental...Ch. 16 - How are wastes carried to the kidney for removal?...Ch. 16 - What is the cause of a fever of 38.3C(101F) ? a....Ch. 16 - Where does the majority of fat digestion take...Ch. 16 - The bile from the liver is delivered to the...
Ch. 16 - Which of the following statements is not true? a....Ch. 16 - The respiratory system_______. a. provides body...Ch. 16 - Which is the order of airflow during inhalation?...Ch. 16 - Where does the right ventricle send blood? a. the...Ch. 16 - During the systolic phase of the cardiac cycle,...Ch. 16 - How do arteries differ from veins? a. Arteries...Ch. 16 - Most of the hormones produced by the anterior...Ch. 16 - What is the function of the hormone...Ch. 16 - Which endocrine glands are associated with the...Ch. 16 - Among other bones, the axial skeleton includes...Ch. 16 - The pectoral girdle supports the_______. a. arms...Ch. 16 - Which component is responsible for initially...Ch. 16 - What kind of muscle tissue is found surrounding...Ch. 16 - Neurons contain ________, which can receive...Ch. 16 - The part of the brain that is responsible for...Ch. 16 - Which part of the nervous system directly controls...Ch. 16 - Describe how the body’s mechanisms maintain...Ch. 16 - Why is excretion important in order to achieve...Ch. 16 - What is the role of the accessory organs in...Ch. 16 - What is the role of minerals in maintaining good...Ch. 16 - Discuss why obesity is a growing epidemic.Ch. 16 - Describe the function of these terms and describe...Ch. 16 - How does the structure of alveoli maximize gas...Ch. 16 - Describe the cardiac cycle.Ch. 16 - What is a similarity and a difference between an...Ch. 16 - Describe how hormone receptors can play a role in...Ch. 16 - Many hormone systems regulate body functions...Ch. 16 - What movements occur at the hip joint and knees as...Ch. 16 - How are neurons similar to other cells? How are...Ch. 16 - What are the main functions of the spinal cord?Ch. 16 - What are the main differences between the...Ch. 16 - What are the main functions of the sensory-somatic...
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- 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 cellarrow_forwardmuscle cells are made up of? A. Z bars b. actin c. myosin d. myofibrilsarrow_forwardTry to explain completelyarrow_forward
- Which cell type helps to repair injured muscle fibers?a. ganglion cellsb. myotube cellsc. myoblast cellsd. satellite cellsarrow_forwardWhat 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. sarcomeresarrow_forwardWhat happens when myosin filaments hydrolyze ATP molecules in muscles? a. Actin–myosin complexes dissociate, leading to muscle contraction. b. Actin–myosin complexes dissociate, leading to muscle relaxation. c. Actin–myosin complexes are formed, leading to muscle contraction. d. Actin–myosin complexes are formed, leading to muscle relaxation.arrow_forward
- 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, myofibrilarrow_forwardWhich 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.arrow_forwardWhich 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.arrow_forward
- Which statement about the diagram is not correct??  A. All of these illustrations and photos represent muscle cells B. Illustrations "B" are skeletal muscle which we know from the striations C. The purple ovals in these illustrations are nuclei D. Illustrations "C" are smooth muscle cellsarrow_forwardStriations are found in the cytoplasm of which type(s) of muscle tissue? Select all that apply. A. Skeletal muscle B. Cardiac muscle C. Smooth musclearrow_forwardWhat 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.arrow_forward
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