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Questions and Answers
What type of muscles are found in the upper limbs?
What type of muscles are found in the upper limbs?
What is another name for skeletal muscles?
What is another name for skeletal muscles?
What type of muscle classification applies when fibers are attached on both sides of a tendon?
What type of muscle classification applies when fibers are attached on both sides of a tendon?
Which muscle is an example of a convergent type of muscle?
Which muscle is an example of a convergent type of muscle?
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What is the name of the fibrous cord that attaches muscle to bone?
What is the name of the fibrous cord that attaches muscle to bone?
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What is the classification of skeletal muscles based on the arrangement of their fibers?
What is the classification of skeletal muscles based on the arrangement of their fibers?
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Which of the following is an example of a pennate muscle?
Which of the following is an example of a pennate muscle?
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Which type of skeletal muscle has fibers arranged in a circular shape?
Which type of skeletal muscle has fibers arranged in a circular shape?
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What is the fixed part of a skeletal muscle called?
What is the fixed part of a skeletal muscle called?
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Which type of muscle is found in the walls of blood vessels and internal organs?
Which type of muscle is found in the walls of blood vessels and internal organs?
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What percentage of body weight do skeletal muscles represent?
What percentage of body weight do skeletal muscles represent?
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Which type of muscle is voluntary and striated?
Which type of muscle is voluntary and striated?
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What is the primary function of skeletal muscles?
What is the primary function of skeletal muscles?
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Which part of the skeletal muscle is the contractile part?
Which part of the skeletal muscle is the contractile part?
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Smooth muscles are primarily located in which of the following?
Smooth muscles are primarily located in which of the following?
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What characterizes cardiac muscle tissue?
What characterizes cardiac muscle tissue?
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What is the tendon in skeletal muscle responsible for?
What is the tendon in skeletal muscle responsible for?
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What type of muscles are smooth muscles?
What type of muscles are smooth muscles?
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Study Notes
Muscular System
- Over 600 skeletal muscles in the body
- Account for 40-50% of body weight
- Muscles and skeleton give body shape and contour
Functions of Skeletal Muscles
- Enable body movement
- Maintain posture
- Stabilize joints
- Position the body
- Generate heat
Definition of Muscle
- The only body tissue able to contract in response to stimuli
- Muscle contraction leads to movement of body parts
Types of Muscles
- Three types: skeletal, smooth, and cardiac
Smooth Muscle
- Non-striated
- Spindle-shaped, uninucleated
- Involuntary
- Found in walls of internal organs (blood vessels, bladder, digestive tract)
- Controlled by autonomic nervous system
Cardiac Muscle
- Rectangular in shape
- Found only in the heart
- Involuntary (responds to electrical impulses)
- Controlled by autonomic nervous system
- Uni-nucleated, striated
Skeletal Muscle
- Striated and tubular
- Multinucleated
- Voluntary (controlled by somatic nervous system)
- Attached to bones
- Found in limbs, abdomen, head, and neck
Differences Between Muscle Types
- Smooth: Non-striated, spindle-shaped, involuntary
- Cardiac: Striated, branched, uninucleated, involuntary
- Skeletal: Striated, tubular, multinucleated, voluntary
Parts of Skeletal Muscle
- Origin: Fixed attachment point on a bone
- Insertion: Movable attachment point on a bone
- Belly (fleshy part): Contractile, thicker middle section of muscle
- Tendon: Fibrous cord connecting muscle to bone
- Aponeurosis: Flattened tendon connecting muscles to bone
Types of Skeletal Muscles
-
Parallel Fibers:
- Quadrilateral
- Strap-like
- Strap-like with intersections
- Fusiform
-
Oblique Fibers:
- Pennate: Unipennate, Bipennate, Multipennate, and Circumpennate
- Triangular (e.g., trapezius)
- Convergent (e.g., pectoralis major)
- Circular (e.g., sphincters)
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Description
Explore the anatomy and functions of the muscular system, focusing on skeletal, smooth, and cardiac muscles. This quiz will test your knowledge on muscle types, their roles in movement, and their contribution to body weight and heat generation.
