Muscle Physiology Lecture Notes

What is the main characteristic that distinguishes glycolytic muscles from oxidative muscles?

What is the primary function of skeletal muscles?

Which type of skeletal muscle fiber has the slowest contraction time?

What determines the ratio of oxidative to glycolytic muscles?

What is a characteristic of Type IIb skeletal muscle fibers?

What is the primary energy production pathway used by oxidative muscles?

Which type of skeletal muscle fiber is suitable for long-term endurance activities?

What is a characteristic of glycolytic muscles?

What determines the size of the motor neuron in skeletal muscles?

What is the primary difference between Type IIa and Type IIx fibers?

Muscle Physiology

Muscle function is a crucial aspect of muscle physiology

Muscle Characteristics

Muscle tissue types include skeletal, cardiac, and smooth muscle

Skeletal Muscle

Skeletal muscle has various types, including oxidative and glycolytic muscles
Ratio of oxidative to glycolytic muscles is dependent on genetics
Glycolytic muscles:
- Have 3 types: Type IIa, IIb, and IIx
- Have fast contraction action
- Are generally paler in color due to lower amounts of myoglobin and vascularity
- Utilize anaerobic pathways for energy
- Not suitable for long-term endurance activities
Oxidative muscles:
- Use aerobic processes
- Suitable for long-term endurance activities
- Are highly vascular and have more myoglobin

Skeletal Muscle Types

Type I fibers:
- Have slow contraction time
- Have small motor neurons
- Have high resistance to fatigue
- Suitability for long-term aerobic activities
Type IIa fibers:
- Have moderately fast contraction time
- Have medium-sized motor neurons
- Have fairly high resistance to fatigue
- Suitability for short-term anaerobic activities
Type IIx fibers:
- Have fast contraction time
- Have large motor neurons
- Have intermediate resistance to fatigue
- Suitability for short-term anaerobic activities
Type IIb fibers:
- Have very fast contraction time
- Have very large motor neurons
- Have low resistance to fatigue
- Suitability for short-term anaerobic activities

This quiz covers muscle physiology, including skeletal, cardiac, and smooth muscle functions, characteristics, and types. It also covers muscle contraction strength and adaptive responses.