Muscles Flashcards
What part of the muscle fiber is like a cell membrane and separates the inside from the outside of the cell; like the security
Sarcolemma
What part of the muscle fiber is a special type of smooth ER and is like a “calcium storage tank”; wraps around myofibrils and spreads nerve signals with T tubules; warehouse
Sarcoplasmic reticulum
What is the structure in a muscle fiber that is a threadlike structure; it makes the muscle central; like an assembly line
Myofibril
What structure are like tunnels that connect sarcolemma to the SR and spreads electric signals; like a telephone line
Transverse tubules
What structure produces ATP for muscle contractions in a muscle fiber
Mitochondria
The muscle fiber has multiple of these and they help repair and maintain large muscle cell; like a power generator
Nucleus
This type of filament has the protein myosin
Thick filament
This type of filament has the proteins actin, troponin, and tropomyosin
Thin filament
This type of filament has the protein titin
Elastic filament
What type of contraction happens when the muscle tenses but the joint doesn’t move
Isometric
What type of muscle contraction happens when the muscle changes lengths while tension remains constant
Isotonic
In an isotonic contraction, what’s the difference between a concentric and eccentric contraction
In a concentric contraction, the muscle shortens (bicep curl up)
In an eccentric contraction, the muscle lengthens (bicep curl down slowly)
What are the organized arrangements of actin and myosin filaments called
Striations
What are the repeating units in striations called; found within myofibrils and are from Z disc to Z disc
Sarcomeres
Sarcomeres
