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Questions and Answers
Which muscle type is responsible for involuntary actions like intestinal movement?
Which muscle type is responsible for involuntary actions like intestinal movement?
- Bicep muscle
- Smooth muscle (correct)
- Cardiac muscle
- Skeletal muscle
What is the primary function of cardiac muscle?
What is the primary function of cardiac muscle?
- To facilitate voluntary movement of limbs
- To control bladder function
- To pump blood throughout the body (correct)
- To stabilize body posture
Which of the following is an example of a skeletal muscle's function?
Which of the following is an example of a skeletal muscle's function?
- Facilitating digestion
- Moving the body (correct)
- Regulating blood pressure
- Controlling heart rate
What action is occurring when the distance between bones attached to a muscle increases during joint movement?
What action is occurring when the distance between bones attached to a muscle increases during joint movement?
During an isotonic contraction, what is the concentric phase characterized by?
During an isotonic contraction, what is the concentric phase characterized by?
What determines the specific movement a muscle can produce?
What determines the specific movement a muscle can produce?
Which muscle type operates without conscious control?
Which muscle type operates without conscious control?
What is the role of the Upper Trapezius muscle?
What is the role of the Upper Trapezius muscle?
What is the function of the Quadriceps Femoris muscle?
What is the function of the Quadriceps Femoris muscle?
Which muscle is involved in breathing?
Which muscle is involved in breathing?
If a researcher is studying the connective tissue surrounding bundles of muscle fibers, which layer are they most likely examining?
If a researcher is studying the connective tissue surrounding bundles of muscle fibers, which layer are they most likely examining?
Considering that muscles constitute approximately 50% of body weight, what is the approximate muscle weight of a person weighing 150 pounds?
Considering that muscles constitute approximately 50% of body weight, what is the approximate muscle weight of a person weighing 150 pounds?
Which process at the microfilament level is directly responsible for the contraction and shortening of muscles?
Which process at the microfilament level is directly responsible for the contraction and shortening of muscles?
If a scientist discovers a new type of cell within muscle tissue, what is the most appropriate term to describe this individual muscle cell?
If a scientist discovers a new type of cell within muscle tissue, what is the most appropriate term to describe this individual muscle cell?
A weightlifter is performing bicep curls. What is the primary action occurring in the bicep muscle during the upward phase of the exercise?
A weightlifter is performing bicep curls. What is the primary action occurring in the bicep muscle during the upward phase of the exercise?
Which of the following is the correct organizational hierarchy within a skeletal muscle, from smallest to largest?
Which of the following is the correct organizational hierarchy within a skeletal muscle, from smallest to largest?
What is the functional result of muscles pulling on bones?
What is the functional result of muscles pulling on bones?
If 'myo' and 'sarco' both relate to muscle, which term would most likely be used in naming the membrane surrounding a muscle fiber?
If 'myo' and 'sarco' both relate to muscle, which term would most likely be used in naming the membrane surrounding a muscle fiber?
Which of the following components is located inside a muscle fiber cell?
Which of the following components is located inside a muscle fiber cell?
Based on the information provided, which of the following statements best describes the relationship between muscle fibers and fascicles?
Based on the information provided, which of the following statements best describes the relationship between muscle fibers and fascicles?
Flashcards
Muscular System
Muscular System
The system that enables body movement through muscles.
Muscle Types
Muscle Types
There are various muscle types based on shape and function.
Muscle Tissue Terminology
Muscle Tissue Terminology
Prefixes myo/mys refer to muscle; sarco refers to flesh.
Muscle Contraction
Muscle Contraction
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Muscle Fibers
Muscle Fibers
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Endomysium
Endomysium
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Perimysium
Perimysium
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Epimysium
Epimysium
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Myofibrils
Myofibrils
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Muscle Fiber Size
Muscle Fiber Size
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Types of muscles
Types of muscles
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Cardiac muscle
Cardiac muscle
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Smooth muscle
Smooth muscle
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Skeletal muscle
Skeletal muscle
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Functions of skeletal muscle
Functions of skeletal muscle
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Origin and insertion
Origin and insertion
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Range of motion
Range of motion
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Isotonic contraction
Isotonic contraction
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Concentric contraction
Concentric contraction
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Eccentric contraction
Eccentric contraction
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Study Notes
Muscles
- The human body has about 600 muscles that constantly move.
- The muscular system enables body movement, including internal movements and changing position.
- Muscles are complex organs with diverse tissue types.
- Muscles constitute approximately 50% of body weight.
Muscle Function
- Muscles contract or shorten to produce movement.
- They pull on structures like bones to generate motion.
Muscle Types
- Muscles come in various shapes and sizes..
- There are three primary muscle types: skeletal, smooth, and cardiac.
Skeletal Muscle
- Skeletal muscles are attached to bones, and their contractions involve conscious control exerted by the brain.
- Examples of skeletal muscles include the biceps brachii (elbow flexion), quadriceps femoris (knee extension), and trapezius (shoulder elevation).
Smooth Muscle
- Smooth muscles operate involuntarily, without conscious control.
- They are found in organs like the intestines and control functions like digestion.
Cardiac Muscle
- Heart muscles (cardiac) are also involuntary in their operation, meaning their activity is not under conscious control.
- They continuously contract to pump blood throughout the body's circulatory system.
- Cardiac muscle tissue is characterized by its unique electrical timer mechanism for sustained, rhythmic contractions.
Muscle Movement
- The fundamental function of muscle is shortening, allowing one bone to move closer to another.
- Muscle movement originates and ends at specific points called the origin and insertion, respectively.
Types of Muscle Movements
- The range of motion that a joint can perform is limited or restricted in its capability.
- Isotonic contractions are actions during which a joint moves under a weight/load, divided into concentric and eccentric phases, where movement causes adjacent bones to come closer/farther.
Muscle Structure
- Muscle fibers are covered by endomysium.
- Bundles of muscle fibers, termed fascicles, are enveloped by perimysium.
- The complete skeletal muscle is encased in epimysium.
- Individual muscle cells, known as muscle fibers or myofibers, are quite extensive in size, measuring about one-tenth the width of a human hair.
- Inside a muscle fiber (cell) are myofibrils(protein filaments), critical for contraction.
Muscle Terminology
- Prefixes such as myo, mys, and sarco all refer to the muscles or flesh.
- The shortening of muscles stems from the movement of microfilaments and myofilaments inside muscle cells (fibers).
- Myofibrils are internal structures, particularly important during contractions.
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Description
Learn about the muscular system which enables body movement. There are three primary muscle types: skeletal, smooth, and cardiac. Muscles contract or shorten to produce movement and constitute approximately 50% of body weight.
