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Chapter 12: Problem 14

The thick filaments of a muscle fiber are made up of a. actin. b. troponin. c. fascia. d. myosin.

Short Answer

Expert verified
The correct answer is d. Myosin, as thick filaments are mainly composed of the protein myosin, while actin and troponin are components of thin filaments and fascia is a connective tissue surrounding muscles.

Step by step solution

01

Understanding muscle fibers and their components

Muscle fibers are composed of many myofibrils, which are in turn made up of two types of protein filaments: thick filaments and thin filaments. These filaments are essential for muscle contraction, and they interact with each other during this process.
02

Understanding thick filaments

Thick filaments are mainly made up of the protein myosin. Myosin has a rod-like tail and globular heads that can bind to actin, which is the primary component of thin filaments.
03

Understanding the other options

Let's briefly go through the other options to establish why they are not the correct answer: a. Actin is the main component of thin filaments, not thick filaments. b. Troponin is a protein complex found on thin filaments that regulate muscle contraction by controlling the binding of myosin to actin. c. Fascia is a specialized connective tissue that surrounds and supports muscles, it is not part of thick filaments.
04

Identifying the correct answer

Given that myosin is the primary component of thick filaments, the correct answer is: d. Myosin

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Most popular questions from this chapter

Describe the sliding filament model of muscle contraction within a sarcomere. Begin with the nerve impulse and end with the relaxation of the muscle. (pages \(261-63\) )

To increase the force of muscle contraction, a. individual muscle cells have to contract with greater force. b. motor units have to contract with greater force. c. motor units need to be recruited. d. All of these are correct. e. None of these is correct.

Nervous stimulation of muscles a. occurs at a neuromuscular junction. b. results in an impulse that travels down the T system. c. causes calcium to be released from expanded regions of the sarcoplasmic reticulum. d. All of these are correct.

What criteria are used to name muscles? Give an example of each one. (pages 256,258 )

Lack of calcium in muscles will a. result in no contraction. b. cause weak contraction. c. cause strong contraction. d. will have no effect e. None of these is correct.
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