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Questions and Answers
What is the primary function of creatine phosphate in the formation of ATP in muscle fibers?
What is the primary function of creatine phosphate in the formation of ATP in muscle fibers?
- To act as a storage form of high-energy phosphate bonds (correct)
- To serve as a cofactor for the enzyme creatine kinase
- To provide a rapid source of phosphate for the glycolytic pathway
- To catalyze the oxidative phosphorylation of ADP in the mitochondria
Which of the following statements about the role of creatine phosphate in ATP formation is correct?
Which of the following statements about the role of creatine phosphate in ATP formation is correct?
- Creatine phosphate is the primary source of ATP for muscle contraction. (correct)
- Creatine phosphate is formed through the oxidative phosphorylation of ADP in the mitochondria.
- The concentration of creatine phosphate increases at the start of muscle contraction.
- The breakdown of creatine phosphate is an irreversible reaction.
How does the concentration of ATP and ADP change in a muscle fiber at the start of contraction?
How does the concentration of ATP and ADP change in a muscle fiber at the start of contraction?
- Both ATP and ADP concentrations remain constant.
- ATP concentration increases while ADP concentration also increases.
- ATP concentration increases while ADP concentration decreases.
- ATP concentration decreases while ADP concentration increases. (correct)
What is the primary limitation of the creatine phosphate system in providing ATP for muscle contraction?
What is the primary limitation of the creatine phosphate system in providing ATP for muscle contraction?
Which of the following best describes the reversible reaction catalyzed by creatine kinase?
Which of the following best describes the reversible reaction catalyzed by creatine kinase?
What is the primary advantage of the creatine phosphate system in providing ATP for muscle contraction?
What is the primary advantage of the creatine phosphate system in providing ATP for muscle contraction?
What is the function of the H zone in skeletal muscle?
What is the function of the H zone in skeletal muscle?
What does the M line in skeletal muscle correspond to?
What does the M line in skeletal muscle correspond to?
What is the relationship between contraction and muscle fiber shortening?
What is the relationship between contraction and muscle fiber shortening?
Which type of neurons innervate skeletal muscle fibers?
Which type of neurons innervate skeletal muscle fibers?
What is the advantage of myelinated axons in motor neurons?
What is the advantage of myelinated axons in motor neurons?
What is a motor unit?
What is a motor unit?
What determines the maximal rate of cross-bridge cycling in skeletal muscle fibers?
What determines the maximal rate of cross-bridge cycling in skeletal muscle fibers?
Which type of skeletal muscle fibers have myosin with low ATPase activity?
Which type of skeletal muscle fibers have myosin with low ATPase activity?
What are the two main subtypes of fast myosin distinguished based on structure?
What are the two main subtypes of fast myosin distinguished based on structure?
Which type of myosin has about four times higher ATPase activity than the other?
Which type of myosin has about four times higher ATPase activity than the other?
How are skeletal muscle fibers classified based on their major pathway to form ATP?
How are skeletal muscle fibers classified based on their major pathway to form ATP?
What contributes to extra oxygen requirement in muscles after contraction has stopped?
What contributes to extra oxygen requirement in muscles after contraction has stopped?
Which type of muscle fibers contain numerous mitochondria and have high oxidative capacity?
Which type of muscle fibers contain numerous mitochondria and have high oxidative capacity?
What is responsible for the dark red color of oxidative muscle fibers?
What is responsible for the dark red color of oxidative muscle fibers?
Which type of muscle fibers have few mitochondria but a high concentration of glycolytic enzymes?
Which type of muscle fibers have few mitochondria but a high concentration of glycolytic enzymes?
What gives glycolytic muscle fibers their pale color?
What gives glycolytic muscle fibers their pale color?
Which characteristic distinguishes slow-oxidative muscle fibers?
Which characteristic distinguishes slow-oxidative muscle fibers?
Which type of muscle fibers are often referred to as white muscle fibers?
Which type of muscle fibers are often referred to as white muscle fibers?
What type of muscle fibers combine high myosin-ATPase activity with high oxidative capacity and intermediate glycolytic capacity?
What type of muscle fibers combine high myosin-ATPase activity with high oxidative capacity and intermediate glycolytic capacity?
Which type of muscle fibers are resistant to fatigue and can maintain contractile activity for long periods with little tension loss?
Which type of muscle fibers are resistant to fatigue and can maintain contractile activity for long periods with little tension loss?
Which type of skeletal muscle fibers are used for quick bursts of strong activation, like jumping or sprinting?
Which type of skeletal muscle fibers are used for quick bursts of strong activation, like jumping or sprinting?
In whole-muscle contraction, what is true about the muscle fibers within a single motor unit?
In whole-muscle contraction, what is true about the muscle fibers within a single motor unit?
Which statement accurately describes the composition of most skeletal muscles?
Which statement accurately describes the composition of most skeletal muscles?
What distinguishes fast-glycolytic skeletal muscles in terms of fatigue resistance?
What distinguishes fast-glycolytic skeletal muscles in terms of fatigue resistance?
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