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Questions and Answers
What is the basic structural and functional unit of the skeletal muscle?
What is the basic structural and functional unit of the skeletal muscle?
- Myofibril
- Tropomyosin
- Sarcoplasmic reticulum
- Sarcomere (correct)
Which part of the muscle fiber contains the T tubules or transverse tubules?
Which part of the muscle fiber contains the T tubules or transverse tubules?
- Sarcomere
- Sarcoplasm
- Sarcoplasmic reticulum
- Sarcolemma (correct)
What is the network of protein fibers that forms a stationary anchor for actin myofilaments to attach?
What is the network of protein fibers that forms a stationary anchor for actin myofilaments to attach?
- Z disc (correct)
- Sarcoplasm
- A band
- I band
Which part of the muscle fiber contains high concentration of calcium ions important in muscular contraction?
Which part of the muscle fiber contains high concentration of calcium ions important in muscular contraction?
What are the tube-like inward folds of the sarcolemma called?
What are the tube-like inward folds of the sarcolemma called?
What is the cytoplasm of the muscle fiber called?
What is the cytoplasm of the muscle fiber called?
What causes the myosin filaments to move, exposing the attachment site on the actin myofilaments?
What causes the myosin filaments to move, exposing the attachment site on the actin myofilaments?
What extends from one Z disc to the next Z disc in a muscle fiber?
What extends from one Z disc to the next Z disc in a muscle fiber?
What is the endoplasmic reticulum of the muscle fiber that contains high concentration of calcium ions important in muscular contraction?
What is the endoplasmic reticulum of the muscle fiber that contains high concentration of calcium ions important in muscular contraction?
Which bundle of protein filaments are found in the sarcoplasm?
Which bundle of protein filaments are found in the sarcoplasm?
What is the function of the muscular system responsible for overall movement of the body?
What is the function of the muscular system responsible for overall movement of the body?
Which property of muscle tissue refers to its ability to shorten forcefully or contract and lengthen passively?
Which property of muscle tissue refers to its ability to shorten forcefully or contract and lengthen passively?
What characteristic gives skeletal muscle its name due to the presence of transverse bands or striation?
What characteristic gives skeletal muscle its name due to the presence of transverse bands or striation?
Which type of muscle is involved in speaking, writing, typing, gesturing, and facial expressions?
Which type of muscle is involved in speaking, writing, typing, gesturing, and facial expressions?
What is the capacity of the muscle to respond to a stimulus known as?
What is the capacity of the muscle to respond to a stimulus known as?
Which connective tissue sheath forms the outer covering of the muscle and is subdivided into numerous bundles called fascicles?
Which connective tissue sheath forms the outer covering of the muscle and is subdivided into numerous bundles called fascicles?
What is the capacity of the muscle to be stretched beyond its normal resting length and still be able to contract called?
What is the capacity of the muscle to be stretched beyond its normal resting length and still be able to contract called?
What is the ability of the muscle to recoil to its original resting length after it has been stretched called?
What is the ability of the muscle to recoil to its original resting length after it has been stretched called?
What constitutes 40% of the total body weight?
What constitutes 40% of the total body weight?
What causes constriction that propels food in the digestive tract and regulates blood flow?
What causes constriction that propels food in the digestive tract and regulates blood flow?
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Study Notes
Skeletal Muscle Structure and Function
- The basic structural and functional unit of skeletal muscle is the sarcomere.
- T tubules (transverse tubules) are located within the sarcolemma, facilitating the spread of electrical signals.
- The Z disc anchors actin myofilaments, providing a stationary point for attachment.
- The sarcoplasmic reticulum contains a high concentration of calcium ions, crucial for initiating muscular contraction.
- Tube-like inward folds of the sarcolemma are referred to as T tubules.
- The cytoplasm of the muscle fiber is known as the sarcoplasm.
- The movement of the myosin filaments is triggered by the interaction of calcium ions and ATP, exposing binding sites on actin myofilaments.
- Myofibrils extend from one Z disc to the next, forming the structural framework of muscle fibers.
- The endoplasmic reticulum of the muscle fiber, known as the sarcoplasmic reticulum, stores high concentrations of calcium ions essential for muscle contraction.
- The myofilaments, which consist of actin and myosin, are found within the sarcoplasm, responsible for muscle contraction.
Muscle Functionality
- A key function of the muscular system is to enable overall movement of the body.
- Contractility refers to muscle tissue's ability to shorten forcefully or contract and extensibility pertains to its capability to be stretched beyond normal resting length while still allowing contraction.
- The characteristic of skeletal muscle featuring transverse bands is termed striations.
- Skeletal muscle is involved in voluntary movements such as speaking, writing, typing, gesturing, and facial expressions.
- The capacity of muscle to respond to a stimulus is known as excitability.
Muscle and Connective Tissue
- The connective tissue sheath forming the outer covering of the muscle is the epimysium, which subdivides into bundles called fascicles.
- The ability of muscle to return to its original length after stretching is termed elasticity.
- Skeletal muscle constitutes approximately 40% of total body weight.
- Contraction in smooth and cardiac muscles helps propel food through the digestive tract and regulate blood flow.
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