Muscles and Locomotion Flashcards
1
Q
skeletal muscle
A
- somatic nervous system
- voluntary
- sarcoplasmic reticulum stores calcium ions (release of Ca+ to initiate sliding of filaments)
- multinucleated cells
- individual innervations of each muscle fiber
- regular array of actin and myosin filaments
- action potential cannot pass from one muscle fiber to another
- high abundance of mitochondria
- striated
2
Q
muscle contraction
A
- actin and myosin filaments sliding over each other
- causes decrease in size of muscle cell (contraction)
3
Q
isometric contraction
A
- constant length
- increase in muscle tension
4
Q
isotonic contraction
A
- muscle shorts
- muscle tension remains constant
5
Q
tonus
A
state of partial contraction that occurs in the resting muscle
6
Q
tetanus
A
condition of sustained muscle contraction due to an overlap of twitch impulses
