Muscle Fiber Membrane and TrPs Formation
83 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is one of the major hypotheses for the genesis of trigger points (TrPs) discussed in the chapter?

  • The energy crisis hypothesis (correct)
  • The vitamin deficiency hypothesis
  • The genetic mutation hypothesis
  • The overhydration hypothesis

What cycle is related to the genesis of a trigger point according to the text?

  • Pain-pleasure cycle
  • Sleep cycle
  • Pain-spasm-pain cycle (correct)
  • Exercise-recovery cycle

What are the relationships examined in the chapter regarding trigger points?

  • Relationships between animals and plants
  • Relationships between celebrities
  • Relationships between countries
  • Relationships between central and attachment TrPs (correct)

What is discussed at the end of the chapter regarding trigger points treatment methods?

<p>Methods of sustained compression compared with deep-stroking massage (A)</p> Signup and view all the answers

What is a trigger point?

<p>A focal area of hyperirritability sensitive to pressure (C)</p> Signup and view all the answers

What is the main characteristic of a latent trigger point?

<p>Only causes pain under compression (A)</p> Signup and view all the answers

Which term is used to describe trigger points that exist within skeletal muscle tissue or muscular fascia?

<p>Myofascial trigger points (A)</p> Signup and view all the answers

What are the two classifications into which all trigger points can be divided?

<p>Active and inactive trigger points (B)</p> Signup and view all the answers

Which hypothesis links the sliding filament mechanism and the energy crisis to the genesis of a trigger point?

<p>Energy crisis hypothesis (A)</p> Signup and view all the answers

What is the main difference between an active and latent trigger point?

<p>Response to compression (C)</p> Signup and view all the answers

What is the term used to describe taut bands of skeletal muscle tissue where trigger points are located?

<p>Taut bands (A)</p> Signup and view all the answers

Which type of TrP does not cause pain unless compressed?

<p>Latent TrP (B)</p> Signup and view all the answers

What term is used for TrPs located within skeletal muscle tissue or muscular fascia?

<p>Myofascial TrPs (D)</p> Signup and view all the answers

What is the key characteristic of an active trigger point?

<p>It may produce pain even without compression (A)</p> Signup and view all the answers

What links the sliding filament mechanism, energy crisis, and genesis of a TrP?

<p>Energy crisis hypothesis (A)</p> Signup and view all the answers

What is the main difference between an active and latent trigger point?

<p>Response to compression (C)</p> Signup and view all the answers

What is the basic structural and functional unit of muscle tissue?

<p>Sarcomere (D)</p> Signup and view all the answers

Where are the thin actin filaments attached in a sarcomere?

<p>To the Z-lines (C)</p> Signup and view all the answers

What causes the myosin-actin cross-bridges to form?

<p>Attachment of myosin heads to actin filaments (B)</p> Signup and view all the answers

What happens when no ATP molecules are present?

<p>Myosin-actin cross-bridges break (C)</p> Signup and view all the answers

What initiates the breakage of the cross-bridges between myosin and actin filaments?

<p>Expenditure of ATP energy (D)</p> Signup and view all the answers

Which component releases stored calcium ions into the sarcoplasm of a muscle fiber?

<p>Sarcoplasmic reticulum (A)</p> Signup and view all the answers

What is the role of T tubules in muscle contraction?

<p>To transmit electrical impulses into the muscle fiber (B)</p> Signup and view all the answers

What causes a structural change that exposes the binding sites of actin filaments to myosin heads?

<p>Binding of calcium ions (A)</p> Signup and view all the answers

What happens when no ATP molecules are present during muscle contraction?

<p>Myosin-actin cross-bridges break (B)</p> Signup and view all the answers

What occurs when ATP is present during muscle contraction?

<p>Myosin heads attach to binding sites on actin filaments (B)</p> Signup and view all the answers

What happens as long as ATP molecules are present during muscle contraction?

<p>Cross-bridges break repeatedly (C)</p> Signup and view all the answers

What contributes to the formation of the pain-spasm-pain cycle according to the text?

<p>A buildup of noxious waste products irritating the nerves (C)</p> Signup and view all the answers

Why do trigger points (TrPs) not form more frequently in the body?

<p>Local muscle contractions are usually intermittent with rest periods allowing nutrient flow (D)</p> Signup and view all the answers

What is a reason that trigger points (TrPs) are often found in postural muscles?

<p>Isometric contractions without rest periods (D)</p> Signup and view all the answers

What triggers the sustained partial depolarization of the motor endplate according to the text?

<p>Excessive acetylcholine secretion (C)</p> Signup and view all the answers

Why does local swelling in a muscle region contribute to trigger point (TrP) formation?

<p>It compresses arterial blood vessels causing ischemia (A)</p> Signup and view all the answers

What is a key factor implicated in the formation of trigger points (TrPs) according to the text?

<p>Localized muscle injuries or irritations (D)</p> Signup and view all the answers

What is the role of ATP molecules in the sliding filament mechanism?

<p>Breaking myosin-actin cross-bridges (B)</p> Signup and view all the answers

What initiates an electrical impulse that travels along the muscle fiber's membrane?

<p>Neurotransmitters in the synapse (C)</p> Signup and view all the answers

What is the function of T tubules in muscle fibers?

<p>Transmit electrical impulses into the muscle fiber (A)</p> Signup and view all the answers

Which molecule is likened to a battery due to its role in storing energy in muscle fibers?

<p>ATP (B)</p> Signup and view all the answers

In a muscle fiber, what is the primary role of ATP molecules?

<p>Contracting sarcomeres (D)</p> Signup and view all the answers

What happens if ATP molecules are not present during Step 11 of the sliding filament mechanism?

<p>Myosin-actin cross-bridges will not break (B)</p> Signup and view all the answers

What is the consequence of not having neurotransmitters in the synapse?

<p>Prevention of impulse transmission into muscle fibers (B)</p> Signup and view all the answers

Which structure absorbs calcium ions back into the sarcoplasmic reticulum after muscle contraction?

<p>Sarcoplasmic reticulum (D)</p> Signup and view all the answers

What initiates an electrical impulse that travels along the outer membrane of a muscle fiber?

<p>Neurotransmitters in synapse (C)</p> Signup and view all the answers

What is responsible for transmitting an electrical impulse into the interior of a muscle fiber?

<p>T tubules (C)</p> Signup and view all the answers

Which theory explains the genesis of trigger points (TrPs) based on energy availability?

<p>Energy Crisis Hypothesis (C)</p> Signup and view all the answers

What happens if ATP molecules are not present during reabsorption of calcium ions by the sarcoplasmic reticulum after sarcomere contraction?

<p>The sarcomere remains contracted causing pain (D)</p> Signup and view all the answers

What can initiate the pain-spasm-pain and contraction-ischemia cycle that leads to trigger point (TrP) formation?

<p>Chemicals causing local pain and tenderness (D)</p> Signup and view all the answers

What can result in the tightening of a muscle via the pain-spasm-pain cycle, predisposing it to trigger point (TrP) formation?

<p>Perceived pain in a muscle (B)</p> Signup and view all the answers

What protective mechanism causes muscles in a region to tighten up if there is any pain or damage to an adjacent tissue?

<p>Muscle splinting (A)</p> Signup and view all the answers

What happens to a muscle that remains in a shortened state for a prolonged period, predisposing it to trigger point (TrP) development?

<p>Adaptive shortening (C)</p> Signup and view all the answers

What happens to muscle contraction when calcium ions are absent in the sarcoplasm?

<p>The muscle contraction ceases (A)</p> Signup and view all the answers

How does the presence of calcium ions affect the exposure of active sites on actin molecules?

<p>It exposes the active sites (B)</p> Signup and view all the answers

Why does a TrP continue to persist without therapeutic intervention?

<p>Due to contraction-ischemia cycle (D)</p> Signup and view all the answers

What role does ATP play in the formation of TrPs?

<p>It helps in muscle relaxation (A)</p> Signup and view all the answers

Why do venous vessels being closed off worsen the condition of TrPs?

<p>Leads to accumulation of acidic waste products (C)</p> Signup and view all the answers

What initiates the contraction-ischemia cycle during muscle contraction?

<p>Blood vessel closure due to muscle contraction (A)</p> Signup and view all the answers

How does the energy crisis hypothesis explain the formation of TrPs?

<p>By depriving the sliding filament mechanism of ATP (A)</p> Signup and view all the answers

What distinguishes a TrP from a globally tight muscle?

<p>&quot;Contracture&quot; caused by central nervous system control (D)</p> Signup and view all the answers

"Globally tight muscles occur due to an excess of __________." Complete the statement based on the text.

<p>&quot;Contraction&quot; (A)</p> Signup and view all the answers

What contributes to the lack of ATP molecules in the muscle tissue affected by tightness?

<p>Closure of arterial blood vessels due to muscle contraction (D)</p> Signup and view all the answers

Why does a muscle that contracts lose its blood supply?

<p>To constrict blood vessels and restrict blood flow (A)</p> Signup and view all the answers

How does a deficiency of ATP molecules lead to persistent muscle contraction?

<p>By preventing muscle relaxation and causing continued contraction (B)</p> Signup and view all the answers

Why do sarcomeres located closest to the motor endplate tend to form TrPs more easily?

<p>They are constantly contracting and shortening due to the energy crisis hypothesis. (D)</p> Signup and view all the answers

What term is used to describe the condition that results from constant irritation at the muscle's attachments?

<p>Enthesopathy (A)</p> Signup and view all the answers

What type of TrP is created by enthesopathy due to the pull of a central TrP?

<p>Attachment TrP (B)</p> Signup and view all the answers

How does excessive muscle contraction primarily contribute to the genesis of TrPs?

<p>It reduces blood supply to the muscle tissue, leading to ischemia. (A)</p> Signup and view all the answers

What happens if the pulling force of a central TrP is sufficiently strong according to the text?

<p>It transfers to the ends of the myofibrils' attachment into bone. (B)</p> Signup and view all the answers

What is a common circumstance that can lead to the formation of TrPs?

<p>Excessive muscle contraction for a prolonged period. (A)</p> Signup and view all the answers

Why do central TrPs tend to create an enthesopathy?

<p>By pulling and stretching sarcomeres, causing irritation at muscle endings. (A)</p> Signup and view all the answers

What happens when a taut band is created within a muscle tissue?

<p>It compresses blood vessels, resulting in ischemia. (C)</p> Signup and view all the answers

What is the basic structural unit and the functional unit of a muscle?

<p>Sarcomere (B)</p> Signup and view all the answers

Where are trigger points (TrPs) located within a muscle?

<p>At the center of muscle fibers (C)</p> Signup and view all the answers

What is the role of Z-lines in a sarcomere?

<p>Anchor actin filaments (B)</p> Signup and view all the answers

What initiates muscle contractions in response to a message from the brain?

<p>Acetylcholine (A)</p> Signup and view all the answers

Where do motor neurons meet individual muscle fibers?

<p>At the motor point (C)</p> Signup and view all the answers

Which filament is located at the center of a sarcomere?

<p>Myosin filament (A)</p> Signup and view all the answers

What floats across the synaptic cleft to bind to the motor endplate of a muscle fiber?

<p>Acetylcholine (C)</p> Signup and view all the answers

'Shortened active insufficiency' can lead to what condition mentioned in the text?

Signup and view all the answers

What structures run the entire length of a muscle?

<p>Muscle fibers (B)</p> Signup and view all the answers

What are some reasons why trigger points (TrPs) may form?

<p>Myofascial TrP pain-spasm-ischemia cycle (B)</p> Signup and view all the answers

Which type of muscles do not have their fibers run from attachment to attachment?

<p>Pennate muscles (D)</p> Signup and view all the answers

What does effective clinical treatment of myofascial pain syndromes require an understanding of?

<p>Sarcomere structure (D)</p> Signup and view all the answers

How does a muscle contract when ordered by the nervous system?

<p>Acetylcholine (B)</p> Signup and view all the answers

What is necessary to understand before discussing Trigger Points (TrPs)?

<p>Sarcomere structure and sliding filament mechanism (D)</p> Signup and view all the answers

More Like This

Muscle Fiber Structure and Function
5 questions
Muscle Fiber and Contraction Quiz
15 questions
Muscle Fiber Contraction and Action Potentials
37 questions
Use Quizgecko on...
Browser
Browser