Textbook Question
Which of the erector spinae muscles is most lateral to the vertebral column?
a. Spinalis muscle
b. Iliocostalis muscle
c. Semispinalis muscle
d. Longissimus muscle
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Ch. 9 The Muscular System
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology24
- Ch. 2 The Chemistry of Life37
- Ch. 3 The Cell54
- Ch. 4 Histology46
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System35
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System41
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart28
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity41
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Not the one you use?Change textbook
Chapter 9, Problem 10
Which of the following muscle groups is considered muscles of inspiration?
a. External intercostal muscles
b. Internal intercostal muscles
c. External oblique muscles
d. Internal oblique muscles
Verified step by step guidance1
Step 1: Understand the process of inspiration (inhalation). During inspiration, the thoracic cavity expands to allow air to enter the lungs. This expansion is facilitated by muscles that increase the volume of the thoracic cavity.
Step 2: Identify the primary muscles involved in inspiration. The diaphragm is the main muscle responsible for inspiration, but other accessory muscles also play a role, such as the external intercostal muscles.
Step 3: Analyze the function of external intercostal muscles. These muscles are located between the ribs and contract during inspiration to elevate the rib cage, increasing the thoracic cavity's volume.
Step 4: Compare the functions of the other muscle groups listed. Internal intercostal muscles are primarily involved in forced expiration, while external and internal oblique muscles are part of the abdominal wall and assist in movements like trunk rotation and forced expiration, not inspiration.
Step 5: Conclude that external intercostal muscles are considered muscles of inspiration because they actively contribute to expanding the thoracic cavity during inhalation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Muscles of Inspiration
Muscles of inspiration are those that facilitate inhalation by expanding the thoracic cavity. The primary muscles involved include the diaphragm and external intercostal muscles, which work together to increase lung volume and decrease pressure, allowing air to flow into the lungs.
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2:00
Introduction to Muscles and Muscle Tissue Example 1
External Intercostal Muscles
The external intercostal muscles are located between the ribs and play a crucial role in the breathing process. During inhalation, these muscles contract to elevate the ribs and expand the chest cavity, thereby aiding in the intake of air into the lungs.
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2:00Introduction to Muscles and Muscle Tissue Example 1
Internal Intercostal Muscles
The internal intercostal muscles are also situated between the ribs but primarily assist in forced expiration rather than inspiration. They work to depress the ribs and reduce the volume of the thoracic cavity during exhalation, contrasting with the role of the external intercostals.
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Related Practice
Textbook Question
Match the muscle with its main action:
_____Sternocleidomastoid muscle
_____Transversus abdominis muscle
_____Internal oblique muscle
_____Rectus abdominis muscle
_____Splenius capitis muscle
_____Quadratus lumborum muscle.
a. Laterally flexes the trunk
b. Flexes the trunk
c. Compresses the abdominal cavity
d. Extends the vertebral column
e. Flexes the head
f. Extends the head
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Textbook Question
Which eye muscle passes through the trochlea and turns the eye inferiorly and laterally?
a. Lateral rectus muscle
b. Inferior rectus muscle
c. Inferior oblique muscle
d. Superior oblique muscle
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Textbook Question
Mark the following statements as true or false. If the statement is false, correct it to make a true statement.
The pectoralis major and coracobrachialis muscles are antagonists.
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Textbook Question
Which of the following is not a muscle of the rotator cuff?
a. Teres major muscle
b. Teres minor muscle
c. Subscapularis muscle
d. Infraspinatus muscle
e. Supraspinatus muscle
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Textbook Question
The thick, bandlike muscle of mastication that covers much of the ramus of the mandible is the:
a. masseter muscle.
b. temporalis muscle.
c. lateral pterygoid muscle.
d. risorius muscle.
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