Muscle Terminology Flashcards

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Questions and Answers

What is an agonist?

A type of nervous tissue

A muscle that causes or controls joint motion (correct)

A muscle that stabilizes the body

A muscle that lengthens when the mover contracts

What is the all-or-none response in muscle fibers?

The property where a muscle fiber contracts fully or not at all.

What is an antagonist muscle?

A muscle that stabilizes a joint

A muscle located on the opposite side of a joint (correct)

A muscle that contracts to produce movement

A muscle that keeps muscles from moving

What is an aponeurosis?

A broad, flat sheet of fibrous connective tissue. Signup and view all the answers

Define concentric action.

A contraction where the muscle shortens with tone. Signup and view all the answers

Contractility refers to a muscle's ability to lengthen with adequate stimulation.

False Signup and view all the answers

What is deep fascia?

A coarse sheet that binds muscles into functional groups. Signup and view all the answers

What does dynamic force refer to?

Force applied that produces movement in an object. Signup and view all the answers

What is eccentric action?

A contraction in which the muscle lengthens with tone. Signup and view all the answers

Elasticity is the ability of a muscle to shorten and produce force.

False Signup and view all the answers

What is excitability in muscles?

The ability to receive and respond to a stimulus. Signup and view all the answers

Define extensibility.

The ability of a muscle to be stretched. Signup and view all the answers

What is fascia?

A fibrous membrane that supports and separates muscles. Signup and view all the answers

What is a fixator?

A stabilizing muscle at a joint that contracts to fix an area. Signup and view all the answers

What does insertion refer to in muscles?

The attachment of a muscle that moves when it contracts. Signup and view all the answers

Define isometric action.

A contraction where the muscle stays the same length with tone. Signup and view all the answers

What is isotonic action?

Action of muscle that occurs when tension develops while it shortens or lengthens. Signup and view all the answers

What is maximal stimulus?

The point at which all motor units of a muscle are recruited. Signup and view all the answers

Define motor unit.

A motor neuron and all the muscle fibers it controls. Signup and view all the answers

What is myoglobin?

A red pigment that stores oxygen in muscle cells. Signup and view all the answers

What does origin refer to in muscles?

The attachment of a muscle that does not usually move. Signup and view all the answers

Define oxygen debt.

The extra oxygen needed to remove lactic acid from anaerobic respiration. Signup and view all the answers

What is resting tone?

A state of tension in resting muscles. Signup and view all the answers

What does reverse action mean?

When the attachment that usually stays fixed moves. Signup and view all the answers

Define sliding filament mechanism.

The process describing skeletal muscle contraction. Signup and view all the answers

What is static force?

Force applied in such a way that it does not produce movement. Signup and view all the answers

Define synergist.

Movers of a joint other than the prime mover. Signup and view all the answers

What is threshold stimulus?

A stimulus at which the first observable muscle contraction occurs. Signup and view all the answers

What are trigger points?

Hyperirritable loci within a taut band of skeletal muscle. Signup and view all the answers

Study Notes

Muscle Terms and Definitions

Agonist: Muscle responsible for joint motion; also referred to as the mover.
All-or-none response: Muscle fiber contracts fully or not at all when stimulated.
Antagonist: Muscle on opposite side of a joint that lengthens when the agonist contracts; performs opposite action.
Aponeurosis: Broad, flat fibrous connective tissue sheet.
Concentric Action: Muscle shortens and creates movement when contractile force exceeds opposing force.
Contractility: Distinct property of muscle tissue that enables it to shorten forcefully upon stimulation.
Deep Fascia: Dense connective tissue that organizes muscles into functional groups; creates intermuscular compartments.
Dynamic Force: Force causing movement in an object.
Eccentric Action: Muscle lengthens while contracting; opposing force exceeds contractile force and controls the mover's action.
Elasticity: Muscle's ability to return to its resting length after being stretched.
Excitability: Muscle's capability to receive and respond to stimuli.
Extensibility: Ability of muscle to stretch and lengthen.
Fascia: Connective tissue that supports and separates muscles; connects skin to muscle.
Fixator: Stabilizing muscle that contracts to hold a body part still, allowing another part to move.
Insertion: Moving attachment point of a muscle; typically distal; where muscle contracts.
Isometric Action: Muscle contracts without changing length; tension across muscle equals opposing force.
Isotonic Action: Muscle develops tension while shortening or lengthening.
Maximal Stimulus: Maximum force of contraction achieved when all motor units are recruited.
Motor Unit: A motor neuron and all muscle fibers it stimulates.
Myoglobin: Oxygen-storing red pigment found in muscle cells.
Origin: Fixed attachment point of a muscle; typically proximal and closest to the midline.
Oxygen Debt: Extra oxygen required to clear lactic acid from anaerobic glucose metabolism.
Resting Tone: Constant tension present in muscles at rest.
Reverse Action: When the origin moves during contraction and the insertion remains fixed.
Sliding Filament Mechanism: Process by which muscle fibers contract; thick and thin filaments slide over each other.
Static Force: Force applied without causing movement in an object.
Synergist: Assisting muscle that contributes to joint movement; can stabilize or support.
Threshold Stimulus: Minimum stimulus required for observable muscle contraction.
Trigger Points: Sensitive spots in muscle tissue that cause pain and can lead to referred pain; found in taut bands of muscle.

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Description

Test your knowledge on muscle terminology with this flashcard quiz. Learn key terms like agonist, antagonist, and all-or-none response. Perfect for students studying anatomy and physiology.