객관식
The minimum stimulus needed to cause muscle contraction is called the __________.
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4. Tissues & Histology
Introduction to Muscle Tissue
객관식
Which type of muscle fibers contain abundant mitochondria, high levels of myoglobin, and are typically red in color?
A
Intermediate fibers
B
Slow oxidative (Type I) fibers
C
Fast glycolytic (Type IIb) fibers
D
Fast oxidative-glycolytic (Type IIa) fibers
검증된 단계별 안내1
Understand the characteristics of muscle fiber types: Muscle fibers are categorized based on their metabolic properties and functional roles. The key types are Slow Oxidative (Type I), Fast Oxidative-Glycolytic (Type IIa), and Fast Glycolytic (Type IIb).
Focus on the features described in the question: The muscle fibers in question are noted for abundant mitochondria, high levels of myoglobin, and a red color. These traits are associated with aerobic metabolism and endurance activities.
Recall the role of mitochondria and myoglobin: Mitochondria are organelles responsible for aerobic energy production, while myoglobin is a protein that binds oxygen, giving muscle fibers a red appearance. These features are prominent in fibers adapted for sustained, low-intensity activities.
Match the characteristics to the fiber type: Slow Oxidative (Type I) fibers are specialized for endurance and aerobic metabolism. They contain abundant mitochondria, high levels of myoglobin, and are red in color due to their oxygen-binding capacity.
Compare with other fiber types: Intermediate fibers (Type IIa) and Fast Glycolytic fibers (Type IIb) have different properties. Type IIa fibers are a mix of oxidative and glycolytic traits, while Type IIb fibers rely on anaerobic metabolism and are pale due to lower myoglobin content.
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