Laboratory Manual for Anatomy and Physiology, 6e Loose-Leaf Print Companion
Laboratory Manual for Anatomy and Physiology, 6e Loose-Leaf Print Companion
6th Edition
ISBN: 9781119304142
Author: Connie Allen, Valerie Harper
Publisher: WILEY
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Chapter 12, Problem 1.1BGL
Summary Introduction

To label: The components of skeletal muscle fibres in Fig 12.1 (a).

Introduction: A complete skeletal muscle is regarded as one of the organs of the muscular system. Muscles are the largest cylindrical structure that composes of the fascicle, muscle fiber, myofibrils, and filaments.

Expert Solution
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Answer to Problem 1.1BGL

Pictorial representation:

Laboratory Manual for Anatomy and Physiology, 6e Loose-Leaf Print Companion, Chapter 12, Problem 1.1BGL , additional homework tip  1

Fig 1: Components of skeletal muscle fibre

Explanation of Solution

The fascicles are bundles of skeletal muscles that are enveloped by connective tissues, which is termed as perimysium. The epimysium is a type of connective tissue that envelops every muscle. The areolar connective tissue that is present inside the muscle is termed as endomysium. This structure composes of nerves as well as capillaries and overlies the sarcolemma. Muscle fibers are smaller in size and they are present inside the fascicle. Myofibrils are rod-like structures and form the basic unit of muscle. They are made of thick and thin filaments.

Summary Introduction

To label: The components of the fascicle in Fig 12.1 (b).

Introduction: Predominant role played by muscles in the human body is contraction. Muscles that are connected with bones, organs, and blood vessels play a significant role in movements. Muscles are also significant for stability of joints, heat production, and posture.

Expert Solution
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Answer to Problem 1.1BGL

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Laboratory Manual for Anatomy and Physiology, 6e Loose-Leaf Print Companion, Chapter 12, Problem 1.1BGL , additional homework tip  2

Fig 2: Components of the fascicle

Explanation of Solution

A muscle fascicle is formed of a bunch of skeletal muscle fibers. These fibers are enveloped by connective tissues known as perimysium. The areolar connective tissue that is present inside the muscle is termed as endomysium. Muscle fibers are smaller structures that are present inside the fascicle. The sarcolemma is a fine, tube-like structure that surrounds the fibres in skeletal muscles. Myofibrils are rod-like structures and form the basic unit of muscle. They are made of thick and thin filaments.

Summary Introduction

To label: The cross-section of a fascicle in a muscle in Fig 12.2 (a).

Introduction: The force that can be generated by a muscle fiber is determined by the muscle fascicle. Tendons are structures that connect the muscle with the bones. This junction is highly prone to injuries.

Expert Solution
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Answer to Problem 1.1BGL

Pictorial representation:

Laboratory Manual for Anatomy and Physiology, 6e Loose-Leaf Print Companion, Chapter 12, Problem 1.1BGL , additional homework tip  3

Fig 3: Cross-section of a muscle fascicle

Explanation of Solution

Skeletal muscle cells appear as long, cylindrical structures; therefore, they are generally referred to as muscle fibers. They are structured into a cluster known as fascicles. The epimysium spreads between fascicles internally, forming septa, which are called perimysium. The perimysium further stretches into thinner strands known as endomysium.

Summary Introduction

To label: The longitudinal section of muscle fibers in Fig 12.2 (b).

Introduction: Skeletal muscle fibers present in humans are large in size. The plasma membrane of the skeletal muscle fiber is known as sarcolemma. This membrane surrounds the sarcoplasm, which is the cytoplasm of the muscle fiber.

Expert Solution
Check Mark

Answer to Problem 1.1BGL

Pictorial representation:

Laboratory Manual for Anatomy and Physiology, 6e Loose-Leaf Print Companion, Chapter 12, Problem 1.1BGL , additional homework tip  4

Fig 4: Longitudinal-section of muscle fibers

Explanation of Solution

The skeletal muscle fibers display striated appearance (striation) that is due to the organisation of myofilaments. These fibers are cylindrical shaped and possess more than one nucleus or multinucleated. The width of a typical muscle fiber is 10-50 μm.

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06:12

Chapter 12 Solutions

Laboratory Manual for Anatomy and Physiology, 6e Loose-Leaf Print Companion

Ch. 12 - __________ Connective tissue covering surrounding...Ch. 12 - __________ Smallest contractile unit within...Ch. 12 - __________ Stores calcium within muscle fiber Ch. 12 - __________ Connective tissue covering surrounding...Ch. 12 - __________ Two terminal cisternae and a T tubule Ch. 12 - ______________________ Rod-like structures within...Ch. 12 - Length does not change when sarcomere shortens. Ch. 12 - This area is the length of thick filaments. Ch. 12 - Center point of attachment for thick filaments. Ch. 12 - Prob. 4SSMCCh. 12 - This area contains only thin filaments. Ch. 12 - Point of attachment for thin filaments. Ch. 12 - This area contains only thick filaments. Ch. 12 - This area contains overlapping thin and thick...Ch. 12 - Prob. 9SSMCCh. 12 - This area disappears in a fully contracted...Ch. 12 - ______________________ Found in synaptic end bulbs...Ch. 12 - ______________________ Area of sarcolemma across...Ch. 12 - ______________________ Space between synaptic end...Ch. 12 - ______________________ Divides into synaptic end...Ch. 12 - Prob. 5TNJCh. 12 - With age, the collagen-containing connective...Ch. 12 - Weight training increases muscle fiber size by...Ch. 12 - Prob. 3UYKCh. 12 - ______________________. Myasthenia gravis Ch. 12 - ______________________. Curare poisoning Ch. 12 - ______________________. Botulinum toxin poisoning Ch. 12 - ______________________. Arrector pili Ch. 12 - ______________________. Tongue Ch. 12 - Prob. 9UYKCh. 12 - Prob. 10UYKCh. 12 - Prob. 11UYKCh. 12 - Prob. 12UYKCh. 12 - Prob. 13UYK
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