Muscular System - Muscle Fiber Types Flashcards
What are the two primary classifications of muscle fibers?
Fast-twitch & Slow-twitch
Fast-twitch muscle fiber
Type 2 A and type 2 B
Slow-twitch muscle fiber
Type 1
What are type 1 muscle fibers?
Characterized by their ability to fire repeatedly with minimal fatigue. They fire more slowly and with less force than type 2
What are type 2 a muscle fibers?
Also known as the intermediate twitch due to its contractile properties. This fiber is a hybrid between type 1 and type 2b, meaning that its contractile properties are faster than type 1 and slower than type 2b. Type 2a have midrange capabilities.
What are type 2 b muscle fibers?
Type 2 b fibers are the classic fast-twitch fibers, which means their contractile propeties are the fastest of all fibers, but they lack the ability to fire reaptedly without fatiguining.
What is Myostatin?
Myostatin is a protein in the body that regulates how large a muscle fiber can become.
What are triglycerides?
Triglycerides are a type of fat (lipid) found in your blood.
What is the role of triglycerides in your body?
When you eat, your body converts any calories it doesn’t need to use right away into triglycerides. The triglycerides are stored in your fat cells. Later, hormones release triglycerides for energy between meals.
What does ATP stand for?
Andosine Triphosphate
On what 2 criteria can muscle fibers be classified?
1) How fast do fibers contract relative to others. 2) How do fibers regenerate ATP.
What is ATP?
Adenosine triphosphate (ATP) is the source of energy for use and storage at the cellular level.
What are the 3 mechanisms for ATP regeneration?
Creatine Phosphate, Anaerobic glycolysis, Aerobic metabolism.
