Muscle Flashcards
(33 cards)
Motor Unit
AKA somatic motor neuron, this constitutes a functional unit
Isotonic contraction
contraction where the tone/tension within a muscle stays the same, but the length changes
Isometric contraction
contraction where muscle length remains the same but muscle tone/tension increases
Strength training
enhances muscle hypertrophy, weight lifting common
Aerobic training
AKA endurance training, DOESN’T enhance muscle hypertrophy but increases muscle’s ability to sustain long moderate exercise
Aerobic training increases..
blood flow, mitochondrias, and muscle size
Strength training increases..
number of myofilaments in each muscle fiber
Hypertrophy
exercise may cause an increase in muscle size, can be enhanced by strength training
How many muscle cells can be stimulated by one motor neuron?
few to hundreds; depending on the particular muscle and the work it does
Rigor Mortis
“stiffness of death,”
stiffness of skeletal muscles shortly after death
White muscle fiber diameter
large
WMF amount of myoglobin
low (light color and low oxygen)
WMF capillaries
little, therefore light color and low oxygen
WMF amount of mitochondria
low
WMF glycogen amount
high, therefore has high amounts of glucose
WMFs run on…
GLYCOLYSIS NIGGAAAA
WMF power and speed
fast twitch, large # of myofilaments, fatigue quickly (sprinters, short duration, because not a lot of oxygen and blood)
Red muscle fiber diameter
1/2 diameter of WMFs
RMF myoglobin amount
high, (dark color and high oxygen)
RMF mitochondria amount
high
RMF capillary amount
high
RMF glycogen amount
low, therefore low glucose levels
RMFs run on…
kreb’s cycle
RMF power and speed
slow twitch, endurance, resistant to fatigue (long distance runners, etc.)
