BIOLOGY:CONCEPTS &...W/ACCESS (LL)
4th Edition
ISBN: 9781260683752
Author: Hoefnagels
Publisher: MCG
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Chapter 25, Problem 5MCQ
Summary Introduction
Introduction:
The muscle tissue that consists of long cells called muscle fibers is known as skeletal muscle tissue. The skeletal muscles are attached to the bones and helps in moving the bones of the skeleton. The smooth muscle tissue is composed of spindle-shaped cells, each containing one nucleus. The smooth muscles are located in digestive tract and arteries and helps in slow and involuntary movements.
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Skeletal, smooth, and cardiac muscle are similar in that they all _____.
A
are divided into motor units
B
require calcium in order to contract
C
undergo mitosis frequently to replace dead or damaged cells
D
have small round cells connected by gap junctions
Which of the following statements about skeletal muscle is CORRECT?
Select one:
a. An increase in Na+ concentration in the cytosol starts muscle filament sliding.
b. The muscle is non-striated and involuntary.
c. The muscle is involved in shivering thermogenesis.
d. The muscle contracts in response to parasympathetic stimulation.
e. The muscle contracts in response to hormones.
In muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules. If a person has too high a concentration of magnesium ions in the blood, magnesium ions can prevent calcium ions from binding troponin.
A) What effect would this have on muscle contraction (strengthen, weaken, or no effect)?
B) Use your knowledge of how muscle fibers contract to explain your answer in part A.
Chapter 25 Solutions
BIOLOGY:CONCEPTS &...W/ACCESS (LL)
Ch. 25.1 - What is the difference between anatomy an d...Ch. 25.1 - What is the relationship among cells, tissues,...Ch. 25.1 - Trace the bodys early development from one...Ch. 25.2 - If you were given a microscope slide with a slice...Ch. 25.2 - Suppose you determine that a tissue sample...Ch. 25.3 - Which organ systems contribute to each of the five...Ch. 25.3 - Prob. 2MCCh. 25.4 - Use figure 25.9 to explain which materials enter...Ch. 25.4 - Prob. 2MCCh. 25.4 - Prob. 3MC
Ch. 25.5 - How does the integumentary system help the body...Ch. 25.5 - Prob. 2MCCh. 25.6 - Prob. 1MCCh. 25.6 - Suggest a specific prediction related to folic...Ch. 25 - Which of the following represents the correct...Ch. 25 - According to the anatomical terms in figure 25.3,...Ch. 25 - Epithelial tissue consisting of multiple layers of...Ch. 25 - Which of the following features do all types of...Ch. 25 - Prob. 5MCQCh. 25 - Ovaries produce gametes and hormones; these organs...Ch. 25 - Prob. 7MCQCh. 25 - The inner layer of skin is __________, whereas the...Ch. 25 - How does the integumentary system influence...Ch. 25 - Distinguish between the following. a. Organs and...Ch. 25 - Use the Internet to research cosmetic surgery....Ch. 25 - Prob. 3WIOCh. 25 - Explain the similarities and differences among the...Ch. 25 - Explain how you use your organ systems (except...Ch. 25 - Describe how the circulatory system connects the...Ch. 25 - Prob. 7WIOCh. 25 - Prob. 8WIOCh. 25 - Describe at least one interaction between skin and...Ch. 25 - 1. What features distinguish the four types of...Ch. 25 - Prob. 2PITCh. 25 - Review the Survey the Landscape figure in the...
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- Striations 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_forwardAll of the following characteristics apply to skeletal muscle except a. They are striated. b. They are multinucleated. c. They are voluntary. d. They contain intercalated discs. e. They are attached to the skeleton by means of tendons.arrow_forwardWhich of the following statements is True?a. Tendons contract using the sliding filament mechanism.b. Tendons are composed primarily of cartilage fibers.c. Tendons attach bones to bones at joints.d. Tendons attach muscles to bone.arrow_forward
- Single-unit smooth muscle cells can stimulate each other because they havea. a latch-bridge.b. diffuse junctions.c. gap junctions.d. tight junctions.e. cross-bridges.arrow_forwardA.What type of contractions do skeletal muscles do? B. What type of contractions do cardiac muscles do? C.a. What type of contractions do smooth muscles do?arrow_forwardThe type of muscle cell under voluntary control is the ________. a. smooth muscle b. skeletal muscle c. cardiac muscle d. visceral musclearrow_forward
- 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.arrow_forwardWhich of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.arrow_forwardWhich component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsarrow_forward
- What kind of muscle tissue is found surrounding the urinary bladder? a. cardiac b. skeletal c. striated d. smootharrow_forwardWhy do you think a person is able to perform anaerobic exercise (such as lifting and holding a heavy weight) only briefly but can sustain aerobic exercise (such as walking or swimming) for long periods? (Hint: Muscles have limited energy stores.)arrow_forwarda. Three kinds of muscle cells- cardiac, smooth and skeletal- differences between their anatomy? Remember that skeletal muscle fibers are a fusion of many cells b. Why are “muscles” like biceps and pecs called “organs”?arrow_forward
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