Muscular System Flashcards
(19 cards)
Skeletal muscle
- voluntary
-elongated fibers - multiple peripheral nuclei
- visible striations
Cardiac muscle
- Branching
-Single nucleus - Visible striations
- involuntary
Smooth muscle
- Spindle shape
- single central nucleus
- no striations
- involuntary
What makes up fascicles
muscle fibers
what type of neurons are motor neurons
efferent
Neurotransmitter in muscles
acetylcholine
Sarcoplasmic reticulum function
- stores calcium
-provides internal structure
Myofibril definition
a rod-like organelle of a muscle cell which is responsible for the contraction of skeletal muscles
T-tubules function
allow the transmission of the action potential
Thick filaments are made of
Myosin
Thin filaments are made of
Actin
Slow twitch muscles
Type 1-Oxidative slow (red fibers)
intermediate twitch muscles
Type 2A- Fast Oxidative glycolytic
fast twitch muscles
Type 2X- Fast glycolytic (white fibers)
Why is Rigor mortis produced?
Muscles require ATP to relax, without ATP they cannot relax therefore they stay contracted, causing rigor mortis after death.
A Side product of muscle fatigue
lactic acid –> causes soreness
Isotonic concentric contraction
muscle is shortening while generating force (know the length and tension graphs)
Isotonic Eccentric contraction
Muscle is lengthening while under tension (know the length and tension graphs)
Isometric contraction
The muscle is under tension but neither shortens nor lengthens (know the length and tension graphs)
