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Questions and Answers
What characteristic is true about red muscle fibers?
What characteristic is true about red muscle fibers?
- They are adapted for fast contraction.
- They rely on anaerobic respiration.
- They have less myoglobin.
- They have a higher number of mitochondria. (correct)
Which of the following is a feature of white muscle fibers?
Which of the following is a feature of white muscle fibers?
- Utilizes aerobic respiration.
- Tendency to accumulate lactic acid. (correct)
- Slower contraction speed.
- Higher concentration of blood capillaries.
What is the primary composition of the human skeletal system?
What is the primary composition of the human skeletal system?
- Mainly bones. (correct)
- Soft connective tissues.
- Cartilage and ligaments.
- Muscle tissue.
What type of respiration do red muscle fibers primarily engage in?
What type of respiration do red muscle fibers primarily engage in?
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How do red muscle fibers differ from white muscle fibers in terms of contraction speed?
How do red muscle fibers differ from white muscle fibers in terms of contraction speed?
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Study Notes
Types of Muscle Fibres
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Red Muscle Fibres:
- Contain high levels of myoglobin, leading to a reddish color and enhanced oxygen storage for prolonged activity.
- Have an extensive network of blood capillaries, facilitating greater oxygen delivery.
- Rich in mitochondria, which support aerobic respiration and energy production.
- Exhibit slower contraction speeds, making them suited for endurance activities.
- Commonly found in human back muscles, essential for maintaining posture.
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White Muscle Fibres:
- Characterized by lower levels of myoglobin, resulting in a whitish appearance due to reduced oxygen storage capacity.
- Fewer blood capillaries limit oxygen supply, leading to quicker fatigue.
- Contain fewer mitochondria, primarily relying on anaerobic respiration for energy, resulting in lactic acid build-up.
- Feature a higher concentration of sarcoplasmic reticulum (SR), enabling rapid contractions.
- Predominantly located in eye muscles, allowing for quick movements and reflex actions.
Human Skeletal System
- Composed primarily of skeletal connective tissues, with bones serving as the fundamental structure.
- Bone matrix is solid and hard yet pliable, designed to withstand mechanical stresses.
- Calcium is a key component of the bone matrix, crucial for maintaining strength and hardness in bones.
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