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Questions and Answers
How many skeletal muscles are present in the human body?
How many skeletal muscles are present in the human body?
More than 600
What percentage of body weight do skeletal muscles represent?
What percentage of body weight do skeletal muscles represent?
Along with the skeleton, muscles contribute to our overall body shape and contours.
Along with the skeleton, muscles contribute to our overall body shape and contours.
True
Smooth muscles are responsible for voluntary movements.
Smooth muscles are responsible for voluntary movements.
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Skeletal muscles are involuntary, meaning they are not under conscious control.
Skeletal muscles are involuntary, meaning they are not under conscious control.
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Skeletal muscles are controlled by the autonomic nervous system
Skeletal muscles are controlled by the autonomic nervous system
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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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What part of the skeletal muscle is responsible for contraction and movement?
What part of the skeletal muscle is responsible for contraction and movement?
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What connects skeletal muscle to bone?
What connects skeletal muscle to bone?
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Aponeurosis is a flattened tendon composed of fibrous tissues.
Aponeurosis is a flattened tendon composed of fibrous tissues.
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Muscles with parallel fibers have fibers that run at an angle to the direction of contraction
Muscles with parallel fibers have fibers that run at an angle to the direction of contraction
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Strap-like muscles are long and narrow, providing precise and focused movements.
Strap-like muscles are long and narrow, providing precise and focused movements.
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Bipennate muscles have fibers that are attached to both sides of a tendon
Bipennate muscles have fibers that are attached to both sides of a tendon
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Circular muscles are also known as sphincters, and they are responsible for opening and closing body openings
Circular muscles are also known as sphincters, and they are responsible for opening and closing body openings
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Convergent muscles are narrow at their origin and broad at their insertion.
Convergent muscles are narrow at their origin and broad at their insertion.
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What is the name of the muscle responsible for the opening and closing of the eyes?
What is the name of the muscle responsible for the opening and closing of the eyes?
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What is the name of the fleshy part of a skeletal muscle?
What is the name of the fleshy part of a skeletal muscle?
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Which type of muscle is found in the wall of blood vessels and internal organs?
Which type of muscle is found in the wall of blood vessels and internal organs?
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What type of muscle is known as striated muscles?
What type of muscle is known as striated muscles?
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Skeletal muscles are responsible for involuntary movements.
Skeletal muscles are responsible for involuntary movements.
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What is the name of the fibrous cord that connects skeletal muscle to bone?
What is the name of the fibrous cord that connects skeletal muscle to bone?
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Which type of muscle classification is characterized by fibers attached to both sides of a tendon?
Which type of muscle classification is characterized by fibers attached to both sides of a tendon?
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Which muscle is named as a sphincter?
Which muscle is named as a sphincter?
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Aponeurosis is the name given to a flattened tendon.
Aponeurosis is the name given to a flattened tendon.
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Which of the following is an example of a convergent type of muscle?
Which of the following is an example of a convergent type of muscle?
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The fleshy part of a skeletal muscle is the fixed part.
The fleshy part of a skeletal muscle is the fixed part.
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Which type of muscle is characterized by its involuntary nature and presence in the walls of internal organs?
Which type of muscle is characterized by its involuntary nature and presence in the walls of internal organs?
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Skeletal muscles are also known as impulsive muscles.
Skeletal muscles are also known as impulsive muscles.
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Study Notes
Introduction to the Muscular System
- More than 600 skeletal muscles in the body
- Account for 40-50% of body weight
- Muscles and skeleton determine body form and contour
Functions of Skeletal Muscles
- Produce body movements
- Maintain posture
- Stabilize joints
- Support body positions
- Generate heat
Definition of Muscle
- The only body tissue capable of contraction in response to stimulus
- Shortens and generates movement of body parts
Types of Muscles
- 3 types: skeletal, smooth, and cardiac
Smooth Muscle
- Non-striated
- Spindle-shaped, uninucleate
- Involuntary
- Found in walls of blood vessels, internal organs (e.g., urinary bladder, gastro-intestinal tract)
- Controlled by autonomic nerves
Cardiac Muscle
- Rectangular, branched shape
- Found only in the heart
- Involuntary
- Responds to direct electrical stimulation
- Controlled by autonomic nerves
- One central nucleus, striated like skeletal muscle
Skeletal Muscle
- Composed of muscle fibers arranged in bundles
- Striated, voluntary
- Attaches to bone
- Controlled by somatic nerves
- Found in upper limbs, lower limbs, abdomen, head, and neck
Differences Between Muscle Types
- Smooth muscle: spindle-shaped, non-striated, uninucleated, involuntary, walls of internal organs
- Cardiac muscle: rectangular, branched, uninucleated, involuntary, walls of the heart
- Skeletal muscle: striated, tubular, multinucleated, voluntary, attached to skeleton
Parts of Skeletal Muscle
- Origin: Fixed part, usually attached to bone
- Insertion: Movable part, may attach to bone, cartilage, skin, or other muscle
- Belly/Fleshy Part: Contractile, thickest middle portion of the muscle
Tendon & Aponeurosis
- Tendon: Fibrous cord, connects muscle to bone (e.g., Achilles tendon)
- Aponeurosis: Flattened tendon, connects muscles to bone, provides support (e.g., plantar aponeurosis)
Types of Skeletal Muscle Arrangement
- Parallel Fibers:
- Quadrilateral (e.g., thyrohyoid)
- Strap-like (e.g., sternomastoid)
- Strap-like with intersections (e.g., rectus abdominis)
- Fusiform (e.g., biceps brachii)
- Oblique Fibers:
- Pennate (unipennate, bipennate, multipennate, circumpennate)
- Triangular (e.g., trapezius)
- Circular (e.g., sphincter muscles of eyes, mouth)
- Convergent Type: Broad origin, tapering insertion (e.g., pectoralis major)
Common Questions & Answers
- (Focus only on the actual facts and figures related to the provided images and content.)*
- Q1: Fixed part of skeletal muscle? A: Origin
- Q2: Muscle type in blood vessels/internal organs? A: Smooth muscle
- Q3: Another name for skeletal muscles? A: Striated muscles
- Q4: Contractile, fleshy part of skeletal muscle? A: Belly
- Q5: Muscle type in upper limbs? A: Skeletal muscle
- Q6: Fibrous cord attaching muscle to bone? A: Tendon
- Q7: Muscle type with fibers on both sides of tendon? A: Bipennate
- Q8: Example of convergent muscle type? A: Pectoralis major
- Q9: Muscle named as sphincter? A: Circular
- Q10: Flattened tendon? A: Aponeurosis
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Description
This quiz explores the fundamentals of the muscular system, including the types of muscles, their functions, and the role they play in body movement and support. Dive into the characteristics of skeletal, smooth, and cardiac muscles, and understand how they contribute to overall bodily function.
