STRUCTURE + MUSCLE CONTRACTION Flashcards
What are the three different types of sheath of connective tissue?
- Epimysium
- Perimysium
- Endomysium
What is found in the muscle (organ)?
Epimysium
What is found in the muscle fascicle?
Perimysium
What is found in the muscle fiber?
Endomysium
What is the myofibril made up of?
Many sacromeres
What is the sacroplasmic reticulum?
Stores Ca2+ for muscle contraction
What is a sacromere?
The basic contractile unit of muscle
What are the boundaries of sacromeres called?
A pair of Z-lines
What is the centre of a sacromere called?
An M-line
What is the structure of a sacromere?
Interdigitation of thick (myosin) and thin (actin) filaments
Is myosin thick or thin?
Thick
Is actin thick or thin?
Thin
What kind of filaments does the H-band contain?
Contains thick filaments only
What kind of filaments does the I-band contain?
Contains thin filaments only
What kind of filaments does the A-band contain?
Contains both thin and thick filaments (zone of overlap)