Concept explainers
Introduction:
Skeleton is a hard structure that protects the internal organs of a living organism. A system, composing bones, muscles, and other tissues that help in the movement and locomotion in an individual, is called a skeletal system.
Answer to Problem 1MCQ
Correct answer:
Exoskeleton and endoskeleton differ from each other in protecting the animal body from outside as well as its ability to grow with an organism. Hence, the correct answer is option d.
Explanation of Solution
Reason for correct answer:
Option d. is given as “both a and b are correct.”
Skeleton system is the culmination of joints and bones present in the body of an individual. The skeleton system secures the internal body organs of different organisms. For example, the skull is part of the skeletal system that helps in the protection of the brain. The exoskeleton protects the individual from different kinds of environmental stress and develops with the growth of the organism.
Reason for incorrect answer:
Option a. is given as, “their ability to protect an animal from the outside.”
The exoskeleton also shows the ability to grow with the organism. Hence, option a. is incorrect.
Option b. is given as, “their ability to grow along with organism.”
The exoskeleton protects the internal organs of the body as well. Hence, option b. is incorrect.
Option c. is given as, “their function as a framework for muscle attachment.”
The concept of muscle attachment is related to the endoskeleton system. Hence, option c. is incorrect.
Hence, the options a., b., and c. are incorrect.
Exoskeleton and endoskeleton differ from each other in protecting the animal body from the outside environment as well as its ability to grow along with an organism. Thus, the correct answer is option d.
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Chapter 26 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
- Explain how an endoskeleton differs from an exoskeleton.arrow_forwardA scientist extracts and measures the calcium content of one of your muscle fibers while you are asleep, when all of your muscles are relaxed. Where is the scientist likely to find calcium? In the T-tubules In the sarcoplasmic reticulum Bound to tropomyosin Bound to troponinarrow_forwardTendons and ligamentsa. are dense fibrous connective tissue.b. are associated with the bones.c. are found in vertebrates.d. contain collagen.e. All of these are correctarrow_forward
- Which of the following is a connective tissue that attaches muscle to bone? a endoskeleton b tendon c ligament d jointarrow_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_forwardSkeletal, 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 junctionsarrow_forward
- Of the 3 kinds of cells found in cartilage, which helps build cartilaginous tissue? Group of answer choices a. osteocytes b. chondroblasts c. osteoblasts d . chondroclasts Since cartilage is largely avascular, how do cartilaginous cells receive nutrients? Group of answer choices a. from nearby capillaries b. diffusion through the matrix c. from the canaliculi throughout d. from nearby nervous tissuearrow_forwardIn 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.arrow_forwardMyosin binds to actin, then bends. What is ATP needed for next? A. to pump the Ca++ “keys” back into the sarcoplasmic reticulum B. to replace the strap and cover the binding sites C. to give feedback to the neuron that contraction occurred D. to un-bind myosin from actin and re-set for another powerstroke.arrow_forward
- Most land animals with exoskeletons are smaller than the volume of a mouse, and most vertebrates are larger than a mouse (marine invertebrates can be somewhat bigger). What keeps an insect with an exoskeleton from being as big as a horse?arrow_forwardUnlike exoskeletons, endoskeletons do not provide protection for the body surface of animals. How can the lack of an external skeletonalso be an advantage for animals?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_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning