Muscles Flashcards
3 types of muscle
- smooth/involuntary (visceral)
- skeletal/voluntary (striated)
- cardiac muscle
fast twitch muscles
- fast oxidative fibers
- large number of mitochonria and myoglobin
- manufacture and split ATP through aerobic and anaerobic exercise
- fast, strong muscle connections, prone to fatigue
fast twitch glycolytic
- white blood cells
- atp at a slow rate by anaerobic metabolism
slow twitch
- red due to large volumes of myoglobin and o2
- resistant to fatigue
- repeated low level contractions
- produce large amounts of ATP
- postural muscles- neck and spine
skeletal muscle
- voluntary
- striated
- conscious control
- stimulated my somatic nervous system
- muscles contract and create movement on the bones they’re attached to
- produce movement, stabilize body
- quads and biceps
muscle fiber types
slow twitch
fast twitch
fast twitch glycolitic
wearing heels effect on muscles
can shorted calf muscles and hamstrings, increase curve of lumbar spine
cardiac muscle
involuntary muscle found in walls of heart
striated
stimulated by sinoatrial node
intercostals
below ribs- ribs lift so lung volume increases
pelvic floor
controls continence and supports fetus
which muscle has highest workload
prime mover- agonist
half of body weight is
muscle
4 types of muscle actors
agonist, antagonist, synergist, fixator
skeletal muscles cross
at least 1 joint
when a muscle or group contracts
it will either create movement at a joint or stabilize a bone
fixator
muscle contracts statically to fix parts of the body to maintain correct position
synergist
other muscles may join in and help the agonist with its movement
antagonist
opposite muscle which relaxes while agonist is contracting allowing movement to occur at joint
agonist
prime mover
how do muscles work in pairs
each muscle has an opposite muscle to allow movement
-when one shortens, the other lengthens
skeletal maturity
girls 13-15
boys 15-17
isometric contractions
-muscle contracts, develops tension but muscle length remains the same with no movement in joint
isotonic contractions
maintain constant tension in muscle when it changes length