What is the most likely reason for muscle fatigue during prolonged exercise?
Increased ATP levels
Depletion of oxygen
Lack of glycogen stores
Accumulation of lactic acid
The Correct Answer is D
A. Increased ATP levels: During exercise, ATP is consumed rapidly to fuel muscle contractions. Increased ATP levels are not a cause of fatigue; rather, ATP depletion can contribute to reduced muscle performance.
B. Depletion of oxygen: Oxygen depletion can limit aerobic metabolism, but muscles often continue generating energy anaerobically. Oxygen shortage alone is not the primary cause of fatigue in prolonged activity.
C. Lack of glycogen stores: Glycogen is a key energy source, and its depletion can reduce endurance. However, fatigue is more directly related to metabolic byproducts affecting muscle contraction.
D. Accumulation of lactic acid: During intense or prolonged exercise, anaerobic metabolism produces lactic acid, which lowers pH in muscle cells. This acidic environment interferes with enzyme activity and muscle contraction, leading to fatigue.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Provide structural support to the body: Structural support is mainly provided by the skeletal system and connective tissues, not the nervous system.
B. Produce hormones for growth and development: Hormone production is the role of the endocrine system; the nervous system may influence hormone release but does not directly produce them.
C. Transmit signals between different parts of the body: The nervous system communicates via electrical and chemical signals between the brain, spinal cord, and peripheral organs, coordinating responses to stimuli and maintaining homeostasis.
D. Regulate the body's temperature: Temperature regulation is managed primarily by the hypothalamus and autonomic responses, with the nervous system playing a coordinating role rather than being the primary regulator.
Correct Answer is B
Explanation
A. Plasma: Plasma is the liquid portion of blood that transports nutrients, hormones, and waste products. It carries a small amount of dissolved oxygen but is not the primary oxygen carrier.
B. Red Blood Cells: Red blood cells contain hemoglobin, a protein that binds oxygen in the lungs and releases it to tissues. They are the main component responsible for oxygen transport throughout the body.
C. White Blood Cells: White blood cells are part of the immune system, defending the body against infection. They do not play a significant role in carrying oxygen.
D. Platelets: Platelets are involved in blood clotting and hemostasis. They do not transport oxygen or contribute to oxygen delivery to tissues.
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