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Questions and Answers
What are muscles that serve as the primary promoters of a movement?
What are muscles that serve as the primary promoters of a movement?
- Fixators
- Antagonists
- Synergists
- Agonists (correct)
Which of the following is not used as a criterion for naming muscles?
Which of the following is not used as a criterion for naming muscles?
- The locations of muscle attachments
- The location of the muscle
- The shape of the muscle
- Whether the muscle is controlled by the involuntary or voluntary nervous system (correct)
- The number of origins for the muscle
Choose the false statement about hamstrings.
Choose the false statement about hamstrings.
- The hamstrings are fleshy muscles of the posterior thigh.
- Hamstrings promote knee rotation. (correct)
- The hamstring crosses the knee joint.
- The hamstring crosses the hip joint.
Which of the following muscles is named for its origin and insertion?
Which of the following muscles is named for its origin and insertion?
Which of the following muscles is named for its action?
Which of the following muscles is named for its action?
Which of the following is correctly matched?
Which of the following is correctly matched?
Most skeletal muscles of the body act as:
Most skeletal muscles of the body act as:
Which is correctly matched?
Which is correctly matched?
Where are most of the muscles that move the hand located?
Where are most of the muscles that move the hand located?
A muscle group that works with and assists the action of a prime mover is a(n):
A muscle group that works with and assists the action of a prime mover is a(n):
What are the muscles that are found at openings of the body collectively called?
What are the muscles that are found at openings of the body collectively called?
What is the main factor that determines the power of a muscle?
What is the main factor that determines the power of a muscle?
If a lever operates at a mechanical disadvantage, it means that the:
If a lever operates at a mechanical disadvantage, it means that the:
When the term biceps, triceps, or quadriceps forms part of a muscle's name, what does it tell you about the muscle?
When the term biceps, triceps, or quadriceps forms part of a muscle's name, what does it tell you about the muscle?
Which generalization concerning movement by skeletal muscles is not true?
Which generalization concerning movement by skeletal muscles is not true?
What is a muscle that provides the major force for producing a specific movement called?
What is a muscle that provides the major force for producing a specific movement called?
The names of muscles often indicate the action of the muscle. What does the term levator mean?
The names of muscles often indicate the action of the muscle. What does the term levator mean?
Muscles are only able to pull; they never push.
Muscles are only able to pull; they never push.
What is the major factor controlling how levers work?
What is the major factor controlling how levers work?
Which of the following describes fascicle arrangement in a pennate muscle?
Which of the following describes fascicle arrangement in a pennate muscle?
Both first- and second-class levers operate at a mechanical disadvantage.
Both first- and second-class levers operate at a mechanical disadvantage.
First-class levers ________.
First-class levers ________.
Regardless of type, all levers follow the same basic principle: effort farther than load from fulcrum = mechanical advantage; effort nearer than load to fulcrum = mechanical disadvantage.
Regardless of type, all levers follow the same basic principle: effort farther than load from fulcrum = mechanical advantage; effort nearer than load to fulcrum = mechanical disadvantage.
Which of these is not a way of classifying muscles?
Which of these is not a way of classifying muscles?
The arrangement of a muscle's fascicles determines its range of motion and power.
The arrangement of a muscle's fascicles determines its range of motion and power.
Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same.
Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same.
In a pennate muscle pattern ________.
In a pennate muscle pattern ________.
What type of muscle assists an agonist by causing a like movement or by stabilizing a joint over which an agonist acts?
What type of muscle assists an agonist by causing a like movement or by stabilizing a joint over which an agonist acts?
If L = load, F = fulcrum, and E = effort, what type of lever system is described as LEF?
If L = load, F = fulcrum, and E = effort, what type of lever system is described as LEF?
Which is correctly matched?
Which is correctly matched?
Flashcards
Agonists
Agonists
Muscles primarily responsible for producing a specific movement.
Antagonists
Antagonists
Muscles that oppose or reverse a particular movement.
Synergists
Synergists
Muscles that assist agonists by contributing to the same movement or stabilizing joints.
Fixators
Fixators
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Sternocleidomastoid
Sternocleidomastoid
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Convergent Muscles
Convergent Muscles
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Pennate Muscles
Pennate Muscles
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Rectus
Rectus
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Brevis
Brevis
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Third-Class Levers
Third-Class Levers
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Muscle Strength
Muscle Strength
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First-Class Levers
First-Class Levers
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Muscle Action
Muscle Action
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Fascicle Arrangement
Fascicle Arrangement
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Levator
Levator
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Circular Muscles
Circular Muscles
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Study Notes
Muscle Types and Functions
- Agonists are primary muscles responsible for movements, while antagonists oppose these actions.
- Synergists assist agonists, helping stabilize joints.
- Fixators stabilize the origin of the agonist to enable efficient movement.
Muscle Naming Criteria
- Muscles can be named based on attachment locations, shapes, or number of origins.
- The involuntary or voluntary control of muscles is not a criterion for naming.
Musculature and Joints
- The hamstrings cross both the knee and hip joints, but do not contribute to knee rotation.
- Muscles may be named for their origins and insertions, exemplified by the sternocleidomastoid.
Fascicle Arrangement
- Muscle structure affects function; convergent muscles have a fan-shaped arrangement, and pennate muscles feature short fascicles attaching obliquely to a central tendon.
- Rectus denotes straight muscles, while brevis indicates shorter muscles.
Skeletal Muscle Mechanics
- Most skeletal muscles function as third-class levers, where effort is applied between load and fulcrum.
- Muscle contraction produces movement by pulling on bones, not pushing.
Muscle Power and Levers
- Muscle strength is primarily determined by the total number of muscle cells available for contraction.
- First-class levers can operate at mechanical advantage or disadvantage based on their configuration.
General Muscle Movement Rules
- Muscles only pull; they cannot push.
- The arrangement of muscle fascicles directly influences a muscle's range of motion and power.
Muscle Classification
- Muscles can be classified by action, location, and shape, but not by the type of muscle fibers.
- Pennate muscles resemble feathers due to their unique fascicle arrangement.
Lever Systems
- The arrangement of effort, load, and fulcrum determines a lever's mechanical advantage.
- LEF describes a third-class lever system, where effort is between load and fulcrum.
Movement Characteristics
- Muscles can produce movements of graded intensity and serve as levers for movement.
- Circular muscles, or sphincters, control the openings of the body.
Function of Muscle Names
- Muscle names often imply their function; for example, levator indicates the muscle functions to elevate or adduct a body part.
Misconceptions in Muscle Movement
- It is incorrect to assume that the two articulating bones move equally during a contraction.
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