Muscular System Flashcards
three types of muscular tissue
skeletal- multinucleated and striated
cardiac- one nucleus striated and intercalated discs
smooth- one nucleus and no striations
nuclei on skeletal muscle is on the outside of the muscle why?
to not get in the way of the muscular contractions
____sends information to move the skeletal muscle
motor control complex
fascicles can be broken down into
muscle fibers
sarcomere proteins can generally be classified in to three categories
contractile proteins
- actin, myosin
regulatory proteins
- tropomyosin
- troponin t
- troponin c
- troponin I
- myosin light chain
structural proteins
type 1 fibers are
fatigue resistant so they do not loose power very fast
type 2 fibers are
faster a lot of power because of more cross bridges but they have less mitochondria so they fatigue faster
contractile proteins
ca cycling proteins
metabolic proteins
are the three major proteins that will all faster and powerful fibers
mitochondria are more prevalent in type 1 or type 2 muscle fibers?
type 1
therefore they are red because of oxidative phosphorylation and have more energy from oxygen!
because they rely on mitochondria for energy they contract slower
conduction velocity is also slow because they are slow twitch muscle fibers
mitochondria is involve in a type of cellular respiration and THEREFORE they do aerobic!!!!
we make a lot more energy with a lot of mitochondria so our contractions will be longer and therefore type 1 don’t fatigue and also very big and strong powerful muscles! and type 1 store their energy in triglycerol so that we can use them for long contractions when we need them
the pennation angle is important in muscle contraction because
the angle allows more fibers to be packed into the muscle because it is angled and there for you may be able to create more force for a small distance
if you exercise train you can increase the __ of pennation
angle
