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Questions and Answers
What is contractility in muscle tissue?
What is contractility in muscle tissue?
Which property of muscle tissue allows it to respond to a nervous impulse?
Which property of muscle tissue allows it to respond to a nervous impulse?
What does extensibility refer to in muscle properties?
What does extensibility refer to in muscle properties?
How does the property of elasticity benefit muscle tissue?
How does the property of elasticity benefit muscle tissue?
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Which of the following statements about muscle contraction is true?
Which of the following statements about muscle contraction is true?
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What is important for skeletal muscle fibers to function properly?
What is important for skeletal muscle fibers to function properly?
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What percentage of a person's weight is accounted for by muscle?
What percentage of a person's weight is accounted for by muscle?
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What is the definition of muscle as described?
What is the definition of muscle as described?
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What is the primary function of muscle tissue?
What is the primary function of muscle tissue?
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What are myofibrils composed of?
What are myofibrils composed of?
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What role do sarcomeres play in muscle tissue?
What role do sarcomeres play in muscle tissue?
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Which of the following describes the cellular composition of muscle tissue?
Which of the following describes the cellular composition of muscle tissue?
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What movement function does muscle primarily produce?
What movement function does muscle primarily produce?
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Which of the following is NOT a function of muscle tissue?
Which of the following is NOT a function of muscle tissue?
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Which structural element extends from one end of a muscle fiber to the other?
Which structural element extends from one end of a muscle fiber to the other?
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What is the primary factor that maintains our body temperature?
What is the primary factor that maintains our body temperature?
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Which type of lever is characterized by the load being placed between the effort and the fulcrum?
Which type of lever is characterized by the load being placed between the effort and the fulcrum?
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What occurs when the body temperature falls below $37^{ ext{°C}}$?
What occurs when the body temperature falls below $37^{ ext{°C}}$?
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How is the energy required for muscle contraction mainly produced?
How is the energy required for muscle contraction mainly produced?
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Which process allows the muscles to maintain posture without fatigue?
Which process allows the muscles to maintain posture without fatigue?
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Which of the following is a sign of disease when body temperature reaches above $37^{ ext{°C}}$?
Which of the following is a sign of disease when body temperature reaches above $37^{ ext{°C}}$?
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What is the effect of muscle contraction on energy?
What is the effect of muscle contraction on energy?
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How does healthy survival relate to body temperature?
How does healthy survival relate to body temperature?
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Which factor does not contribute to the heat needed for maintaining body temperature?
Which factor does not contribute to the heat needed for maintaining body temperature?
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When is energy primarily used during muscle contraction?
When is energy primarily used during muscle contraction?
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What is the primary function of skeletal muscle tone?
What is the primary function of skeletal muscle tone?
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What occurs to muscle fibers during sustained partial contraction?
What occurs to muscle fibers during sustained partial contraction?
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What is a consequence of prolonged muscle contraction without adequate rest?
What is a consequence of prolonged muscle contraction without adequate rest?
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What primarily leads to muscle fatigue?
What primarily leads to muscle fatigue?
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How does a muscle respond to extreme fatigue?
How does a muscle respond to extreme fatigue?
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What happens when oxygen levels are low during muscle activity?
What happens when oxygen levels are low during muscle activity?
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Which factor contributes to muscle contraction failure during sustained activity?
Which factor contributes to muscle contraction failure during sustained activity?
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What is the role of gravity in muscle tone?
What is the role of gravity in muscle tone?
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What byproduct accumulates in muscles during prolonged exercise without sufficient recovery?
What byproduct accumulates in muscles during prolonged exercise without sufficient recovery?
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What happens to ATP levels during excessive muscular contraction over time?
What happens to ATP levels during excessive muscular contraction over time?
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What is primarily responsible for energy extraction in anaerobic conditions?
What is primarily responsible for energy extraction in anaerobic conditions?
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What is a function of muscles besides generating movement?
What is a function of muscles besides generating movement?
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What happens when muscles contract?
What happens when muscles contract?
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How is the strength of muscle contraction affected?
How is the strength of muscle contraction affected?
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In a first order lever system, what determines the movement of force?
In a first order lever system, what determines the movement of force?
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What is a result of sudden rapid stimulation of many muscle fibers?
What is a result of sudden rapid stimulation of many muscle fibers?
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Which of the following is NOT a function of muscles?
Which of the following is NOT a function of muscles?
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What does muscle tone contribute to?
What does muscle tone contribute to?
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Which of the following best describes muscle fibers during contraction?
Which of the following best describes muscle fibers during contraction?
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What is the relationship between the load and speed of a given movement in lever systems?
What is the relationship between the load and speed of a given movement in lever systems?
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Study Notes
Muscle Tissue Overview
- Muscle accounts for 40% of a person's weight.
- Definition: A band of fibrous tissue in the body capable of contraction for movement and maintaining body position.
Types of Muscle Tissue
- Muscle tissue is composed of muscle cells, which contain myofibrils, the contractile threads of a muscle.
- Myofibrils consist of sarcomeres, the smallest functional unit, made of filaments (myosin and actin).
Functions of Muscle
- Movement: Muscles cause movement by contracting and pulling on skeletal structures.
- Posture and Muscle Tone: Maintains posture without fatiguing through sustained partial contraction.
- Stability: Provides joint stability and protection of internal organs.
- Temperature Regulation: Muscle contraction generates heat, essential for maintaining body temperature.
- Circulation and Respiration: Aids in the movement of blood and air within the body.
- Urination and Digestion: Involved in the expulsion of waste and movement of food through the digestive tract.
Mechanism of Muscle Contraction
- Muscles shorten forcefully during contraction but lengthen passively.
- Strength of contraction depends on the number of muscle fibers activated.
- Rapid stimulation of many fibers can cause a twitch response.
Muscle Fatigue
- Occurs when there is insufficient oxygen, nutrients, or a buildup of waste products like lactic acid.
- Muscle may refuse to contract despite continued stimulation, leading to fatigue.
Lever Systems in Movement
- Skeletal muscles work with the bones to create levers for movement.
- Two primary functions: generate effort to overcome loads and increase movement speed.
Properties of Muscle Tissue
- Contractility: Ability to forcefully shorten during contraction; muscles can only pull, not push.
- Excitability: Ability to respond to stimuli from motor neurons or hormones.
- Extensibility: Capability of being stretched beyond resting length.
- Elasticity: Ability to return to original length after being stretched or contracted.
Muscle Cell Functionality
- Stimulation through nerve impulses is essential for skeletal muscle function.
- Sustained muscle tone is maintained by alternating contractions of muscle fibers against gravity.
Heat Production
- Contraction of muscle fibers generates heat, crucial for maintaining body temperature.
- Energy from ATP breakdown is involved in muscle contraction, with some energy lost as heat.
Conclusion of Part 1
- Understanding the structure, functions, and properties of muscle tissue is essential for analyzing movement, physical performance, and health outcomes related to muscular activity.
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Description
Test your knowledge on the essential properties of muscle tissue including contractility, excitability, extensibility, and elasticity. This quiz reviews the fundamental characteristics that enable muscle function and performance in the human body.
