9 Questions
What is the primary function of actin and myosin in muscle cells?
Actin and myosin are involved in muscle contraction through a sliding filament system
Which statement best describes the energy sources primarily utilized by cardiac muscle?
Cardiac muscle mainly utilizes fatty acids, glucose, and lactate for energy.
How are smooth muscles different from skeletal muscles?
Skeletal muscles are voluntary, but smooth muscles are involuntary.
What is the role of creatine phosphate in muscle cells during exercise?
Creatine phosphate helps regenerate ATP in muscle cells during exercise.
What happens when there is an absence of the protein dystrophin in the body?
It leads to Duchenne's muscular dystrophy characterized by muscle atrophy.
Which type of muscle fibers have low oxidative capacity and generate most of their ATP through glycolysis?
Type IIB muscle fibers
What is the main source of ATP during exercise in type IIB fast-twitch glycolytic muscle fibers?
Anaerobic glycolysis
What process provides a considerable portion of the ATP requirement at the onset of exercise for the first few minutes?
Glycogenolysis
Which enzyme further inhibits hexokinase in the process of anaerobic glycolysis?
Glucose 6-phosphate
Test your knowledge on muscle fiber types and metabolism during different exercise conditions, including fast-twitch glycolytic muscle fibers, anaerobic glycolysis, and aerobic metabolism. Understand how ATP is generated in muscles at rest and during strenuous activities.
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