Domanda del libro di testo
Areas of the body where you would not expect to find slow fibers include the
(a) Back and calf muscles
(b) Eye and hand
(c) Chest and abdomen
(d) All of these
604
views
Ch. 10 Muscle Tissue
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Capitolo 10, Problema 22
For each portion of a myogram tracing a twitch in a stimulated calf muscle fiber, describe the events that occur within the muscle fiber.
Guida verificata passo dopo passo1
Identify the three main phases of a muscle twitch as shown on a myogram: the latent period, the contraction phase, and the relaxation phase.
During the latent period, explain that the muscle fiber is preparing to contract; this includes the action potential traveling along the sarcolemma and down the T-tubules, leading to calcium ion release from the sarcoplasmic reticulum.
In the contraction phase, describe how calcium ions bind to troponin, causing tropomyosin to move and expose the active sites on actin filaments, allowing cross-bridge cycling between actin and myosin, which generates tension and shortens the muscle fiber.
During the relaxation phase, explain that calcium ions are actively pumped back into the sarcoplasmic reticulum, tropomyosin covers the active sites on actin again, cross-bridge cycling stops, and the muscle fiber returns to its resting length as tension decreases.
Summarize that the myogram tracing reflects these internal events: the latent period corresponds to excitation-contraction coupling, the contraction phase corresponds to cross-bridge activity and tension development, and the relaxation phase corresponds to calcium reuptake and muscle fiber relaxation.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
3mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Phases of a Muscle Twitch
A muscle twitch consists of three phases: the latent period, contraction phase, and relaxation phase. The latent period is the brief delay after stimulation before contraction begins. During contraction, the muscle fibers shorten as tension increases. In relaxation, the muscle returns to its resting state as tension decreases.
Video consigliato:
Percorso guidato
03:21
Phases of Mitosis
Excitation-Contraction Coupling
Excitation-contraction coupling is the process linking muscle fiber stimulation to contraction. It involves the generation of an action potential, release of calcium ions from the sarcoplasmic reticulum, and the interaction of actin and myosin filaments that produce muscle tension.
Video consigliato:
5:47B. Excitation-Contraction Coupling
Role of Calcium Ions in Muscle Contraction
Calcium ions released into the cytoplasm bind to troponin, causing a conformational change that moves tropomyosin away from actin's binding sites. This allows myosin heads to attach to actin, forming cross-bridges and enabling contraction. When calcium is pumped back, the muscle relaxes.
Video consigliato:
4:27Steps of Muscle Contraction Example 1
Pratica correlata
Domanda del libro di testo
What forms of energy reserves do resting skeletal muscle fibers contain?
825
views
Domanda del libro di testo
How does cardiac muscle tissue contract without neural stimulation?
999
views
Domanda del libro di testo
What is the calcium-binding protein in smooth muscle tissue?
901
views
Domanda del libro di testo
Bill broke his leg in a football game, and after six weeks the cast is finally removed. As he steps down from the examination table, he loses his balance and falls. Why?
721
views
Domanda del libro di testo
Linda's father suffers an apparent heart attack and is rushed to the emergency room of the local hospital. The doctor on call tells her that he has ordered some blood work and that he will be able to tell if her father actually had a heart attack by looking at the blood levels of CK and cardiac troponin. Why would knowing the level of CK and cardiac troponin help to indicate if a person suffered a heart attack?
703
views