Skip to main content
Ch. 10 Muscle Tissue and Physiology
Amerman- Human Anatomy & Physiology 3e
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoAmerman 3rd EditionCh. 10 Muscle Tissue and PhysiologyProblema 14
Capitolo 10, Problema 14

Muscle tone is:
a. The result of voluntary shortening of the muscle.
b. The result of a small amount of involuntary activation of motor units by the nervous system.
c. Abnormal—a person's muscles should be relaxed normally.
d. Present only where there is damage to the nervous system.

Guida verificata passo dopo passo
1
Understand the concept of muscle tone: Muscle tone refers to the continuous and passive partial contraction of muscles, which helps maintain posture and readiness for action.
Recall that muscle tone is maintained by the nervous system through the involuntary activation of motor units. This ensures that muscles are never completely relaxed, even at rest.
Eliminate incorrect options: Option (a) is incorrect because muscle tone is not the result of voluntary shortening; it is involuntary. Option (c) is incorrect because muscle tone is normal and necessary for posture and function. Option (d) is incorrect because muscle tone is not limited to cases of nervous system damage.
Focus on the correct option: Option (b) aligns with the definition of muscle tone, as it involves the involuntary activation of motor units by the nervous system.
Conclude that the correct answer is based on the physiological mechanism of muscle tone, which is essential for maintaining posture and readiness for movement.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Muscle Tone

Muscle tone refers to the continuous and passive partial contraction of the muscles, which helps maintain posture and readiness for action. It is not the result of voluntary movement but rather a state of slight tension in the muscles due to involuntary activation of motor units by the nervous system.
Video consigliato:
2:00
Introduction to Muscles and Muscle Tissue Example 1

Motor Units

A motor unit consists of a motor neuron and the muscle fibers it innervates. The activation of motor units is crucial for muscle tone, as even at rest, some motor units are activated to maintain a baseline level of muscle tension, contributing to overall muscle readiness and stability.
Video consigliato:
Percorso guidato
05:05
Atoms- Smallest Unit of Matter

Nervous System Regulation

The nervous system plays a vital role in regulating muscle tone through the central nervous system's control over motor neuron activity. This regulation ensures that muscles are neither completely relaxed nor overly contracted, allowing for efficient movement and posture maintenance.
Video consigliato:
1:32
The Central Nervous System
Pratica correlata
Domanda del libro di testo

Which of the following factors is/are responsible for muscular fatigue?

a. Accumulation of chemicals, including calcium and phosphate ions & increased blood flow to the muscle

b. Decreased availability of oxygen

c. Psychological and environmental factors

d. Depletion of key metabolic fuels, such as creatine phosphate

743
views
Domanda del libro di testo

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

A muscle fiber changes length during isotonic concentric and isotonic eccentric contractions.

803
views
1
rank
Domanda del libro di testo

Which of the following types of muscle fibers have low myosin ATPase activity and are classified as slow-twitch?

a. Type I fibers

b. Type IIa fibers

c. Type IIx fibers

d. Type III fibers

831
views
Domanda del libro di testo

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Muscles that require a great deal of precise control will have large motor units.

854
views
Domanda del libro di testo

Which of the following is not likely to result from endurance training alone?

a. Increase in oxidative enzymes in the muscle fiber

b. Increased numbers of mitochondria

c. Hypertrophy of the muscle fibers

d. Increase in blood supply to the muscle fibers

816
views
Domanda del libro di testo

Resistance-type activities will likely rely on _______ energy sources, whereas endurance activities will probably rely on _____ energy sources.

744
views