Muscle Flashcards
(30 cards)
Which muscle type(s) has striations?
Skeletal and cardiac
Which muscle type(s) are voluntary?
Skeletal
Where are the nuclei positioned in smooth muscle cells?
Central
Where are the nuclei positioned in skeletal muscle cells?
Peripherally
Where are the nuclei positioned in cardiac muscle cells?
Central
Which type of muscle is branched and contains intercalated discs?
Cardiac
Give the names of the parts of skeletal muscle in hierarchical order.
Myofibril
Muscle fibre (cell)
Fasciculus
Muscle belly
What is the sarcolemma?
Cell membrane of a muscle cell
What is the sarcoplasm?
Cytoplasm of muscle cell (between myofibrils)
What is the endomysium?
Area between muscle fibres!
What is the perimysium?
Area between fasciculi
What is the epimysium?
Deep fascia surrounding muscle
What are myofibrils composed of?
Sarcomeres joined end to end by Z-lines
Draw a sarcomere!
:)
What is the line in the middle of a sarcomere called?
M-line
What is the name of the area in the centre of the sarcomere where its only myosin?
H zone
What is the name of the area at the edge of the sarcomere where its only actin?
I band
What is the name of the area where actin and myosin overlap?
A band
Describe actin.
Thin
Describe myosin.
Thick, with myosin heads
Name the 3 types of skeletal muscle.
Type 1
Type 2a
Type 2b
Describe type 1 skeletal muscle.
SLOW TWITCH
fatigue resistant, many mitochondria and fat droplets
Describe type 2a skeletal muscle.
FAST TWITCH
fatigue resistant
Describe type 2b skeletal muscle.
FAST TWITCH
fatigable
