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A skinny, 22 year-old male visits the local medical clinic due to severe…

- - - - Step 3: Cross-Bridge Formation
        
        Step 4: Myosin Head Pivoting
        
        Step 5: Cross-Bridge Detachment
        
        Step 6: Myosin Reactivation
        
        Myosin reactivation occurs when the free myosin head splits ATP into ADP and P.
        The energy released is used to recock the myosin head.
        
        When another ATP binds to the myosin head, the link btwn the myosin head and the active site on the actin molecule is broken. The active site in now exposed and able to form another cross bridge.
        
        After cross-bridge formation, the stored energy is used to pivot the myosin head toward the M line. This action is called the power stroke, when it occurs, the bound ADP and phosphate group are released.
        
        Once the active sites are exposed, the energized myosin heads bind to them, forming cross bridges.
      - Calcium ions bind to troponin, weakening the bond between actin and the troponin-tropomyosin complex.This reaction leads to the exposure of the active sites on the actin molecules of the thin filaments.
- - - - blood fatty acids
        
        intramuscular triacylglycerols
        
        lipids that circulate in your blood: Triglycerides store unused calories and provide your body with energy.
      - blood sugar drops during intense activity and glycogen is sent from the liver
- - - - stress, anxiety, and depression.
      - Physical
        
        anemia, diabetes, glandular fever, and cancer.
        
        Physiological
        
        pregnancy, breast-feeding, inadequate sleep, and excessive exercise.
- - - - vegan diet (mostly fruit juices)
        
        avoids "sports drinks"
        
        it contains high levels of sugar and food dyes, which may increase people's risk of certain health conditions, including weight gain and type 2 diabetes
        
        can help replace what we lose during longer duration exercise, especially in the heat. contains electrolytes which are minerals that maintain your body's ionic balance.
        
        gives you a good morality feeling if you're not okay with killing animals
        
        you have to be tedious on taking certain vitamins and supplements for protein
      - skipping meals can make you lose weight too much and you have no way to gain energy through food
      - skipping meals puts your body into survival mode making you hungry so you eat more to gain weight
- - - - sarcolemma
        
        acts as a barrier between the extracellular and intracellular compartments, defining the individual muscle fiber from its surroundings.
    - - the fibrous sheath that covers each bundle/fascicle of single muscle fibres
    - - connects muscle fibers to one another
  - - - It is a layer of dense irregular connective tissue which ensheaths the entire muscle and protects muscles from friction against other muscles and bones.
- - - - desmosomes
        
        1 nucleus
        
        contains all of the cell’s genetic material.
        
        found within intercalated discs. They help hold the cardiac muscle fibers together during a contraction.
      - small connections that join cardiac muscle cells (cardiomyocytes) to each other.
- - - - sarcomeres
        
        composed of long, fibrous proteins as filaments that slide past each other when a muscle contracts or relaxes.