Unit 7 MUSCULAR Flashcards
FUNCTIONS OF THE MUSCULAR SYSTEM
4
- Guard entrances and exits of body
- Thermoregulation
- Supports soft tissue
- Helps maintain your posture
HOW DO MUSCLES MOVE THE SKELETON?
By contraction muscles pull on bones and allow the body to move
FUNCTIONAL UNIT OF MUSCLE CONTRACTION
KNOW HOW TO DRAW IT
Sarcomere
- Ends are called Z lines
- Thick to thick filament is called A band
- Only thick no overlap is H band
- Only thin I band
- Middle is M line
- H and I bands shorten when your muscles contract
THICK AND THIN
FILAMENTS
Thick - Myosin
Thin - Actin
NEUROMUSCULAR JUNCTION
PHOTO ON PHONE
Where a neuron interacts w/ a muscle
Where the axon terminal and muscle interject
NEUROTRANSMITTER IN MUSCLE CONTRACTION
Acetycholine, binds to receptors on the outside of the muscle fiber
RIGOR MORTIS
&
WHAT HAPPENS
- Stiffening of joints and muscles after death for a few days
- After death ATP is no longer produced
- No ATP leads to no Myosin head release
- Muscles become stiff
BOTULISM DISEASE
- Neurons dont release ACH
- No ACH = No contraction
- Leads to Flaccid Paralysis (Go limp and die overtime)
TETANUS DISEASE
Bacteria produces a toxin that affects the brain and nervous system, leading to stiffness in the muscles
MOTOR UNIT
PHOTO ON PHONE
Group of motor units often work together to coordinate the contractions of a single muscle
ISOMETRIC
&
ISOTONIC
(MUSCLE CONTRACTION)
Isometric - Flexing but not moving them (Planks/wall sits)
Isotonic - Moving and flexing (Squats/curls)
FAST AND SLOW FIBERS
Fast - Fatigue quickly (White muscles)
Slow - Endurance (Red muscles)
WHITE AND REDS MUSCLES
White - Anaerobic w/out oxygen
Red - (Myoglobin = oxygen) Aerobic w/ oxygen
HYPERTROPHY
The enlargement of an organ or tissue from the increase in size of its cell (INCREASED MUSCLE MASS)
ORGINS
-
INSERECTIONS
-
ACTIONSO - Where a muscle starts (Tendon is proximal)
I - Where a muscle ends (Tendon is distal)
