Concept explainers
Concept introduction: Muscle is defined as a type of soft tissue found in animals and humans. There are three types of muscles such as striated muscle, non-striated, and cardiac muscles. It is composed of actin and myosin protein filaments that slide into one another and cause contraction of the muscle.
Answer to Problem 1DYB
Correct answer: Agonist is the primary muscle that produces a movement. Therefore, option b. is correct.
Explanation of Solution
Reason for the correct statement:
Agonist is also known as a prime mover. This muscle contracts primarily to produce a particular movement, such as extending the forearm. Therefore, this muscle initiates movement.
Option b. is given as “It is the primary muscle that produces a movement”.
Agonist is the primary muscle that produces a movement. It is the accurate statement about agonist. Hence, option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “It opposes the function of the prime mover”. Antagonist muscle is a type of muscle that opposes the function of the prime mover. Hence, option a. is incorrect.
Option c. is given as “Its function primarily to stabilize the joint”. Antagonist stabilizes the joint. Hence, option c. is incorrect.
Option d. is given as “Its muscle fibers are always circular in structure”. Agonist is a type of muscle that only provides shape to muscle. Hence, option d. is incorrect.
Hence, options a., c., and d. are incorrect.
Agonist is a muscle and is also called prime mover as it contracts to initiate the movement of muscles.
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Chapter 11 Solutions
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