A fast glycolytic fiber would be needed for which action?
Sprinting
Raking leaves
Maintaining posture
Hitting a golf ball
Running a marathon
The Correct Answer is A
Choice A reason: Fast glycolytic fibers are specialized for short bursts of high-intensity activity. They rely on anaerobic metabolism, have large diameters, high glycogen content, and contract rapidly. Sprinting demands explosive power and speed, making these fibers ideal for the task.
Choice B reason: Raking leaves is a moderate-intensity, sustained activity that relies more on slow oxidative or intermediate fibers. It does not require the rapid, forceful contractions characteristic of fast glycolytic fibers.
Choice C reason: Maintaining posture involves continuous, low-intensity contractions, typically supported by slow oxidative fibers. These fibers are fatigue-resistant and suited for endurance, not rapid force generation.
Choice D reason: Hitting a golf ball involves a quick, forceful movement, but it is more reliant on fast oxidative-glycolytic fibers due to the need for both speed and some endurance. It is not as purely anaerobic and explosive as sprinting.
Choice E reason: Running a marathon is a prolonged endurance activity that depends heavily on slow oxidative fibers, which are efficient at aerobic metabolism and fatigue-resistant. Fast glycolytic fibers are not suited for this type of sustained effort.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: The sarcomere is the smallest contractile unit of a skeletal muscle. It is composed of actin and myosin filaments arranged in a precise pattern that allows for muscle contraction. Sarcomeres are repeated along the length of a myofibril and are responsible for the striated appearance of skeletal muscle.
Choice B reason: The sarcoplasmic reticulum is a specialized form of endoplasmic reticulum in muscle cells that stores and releases calcium ions, which are essential for muscle contraction. However, it is not the contractile unit itself.
Choice C reason: The sarcolemma is the plasma membrane of a muscle fiber. It plays a role in conducting electrical signals but is not the structural unit responsible for contraction.
Choice D reason: A myofibril is a long, cylindrical organelle found within muscle cells that contains many sarcomeres. While it contributes to muscle contraction, it is composed of multiple sarcomeres and is not the fundamental unit.
Correct Answer is E
Explanation
Choice A reason: The scapula is part of the appendicular skeleton, not the axial skeleton. Therefore, this combination is incorrect.
Choice B reason: The pelvis includes both axial and appendicular components, but the pelvic girdle is considered part of the appendicular skeleton. This makes the answer inaccurate.
Choice C reason: Both the pectoral and pelvic girdles are part of the appendicular skeleton. Including them in the axial skeleton is incorrect.
Choice D reason: Arms, legs, hands, and feet are all part of the appendicular skeleton. They are not included in the axial skeleton.
Choice E reason: This is the correct answer. The axial skeleton consists of the skull, vertebral column, and rib cage. These structures form the central axis of the body and protect vital organs such as the brain, spinal cord, and thoracic organs.
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