application 8 revised

     I would explained my friend that during weight lifting,her muscles primarily produce energy (in the form of ATP) through aerobic respiration, which involves using oxygen to break down glucose and fuel muscle contractions.When her muscles contract, ATP molecules had to broken down to release energy.The frequency and intensity of these signals determine the force and duration of muscle contractions.

(1)  For short bursts of intense activity like weight lifting , her muscles rely on stored creatine phosphate (CP) to rapidly regenerate ATP.

(2)  For moderate-intensity exercise, glucose breakdown via glycolysis generates ATP. 

(3) For longer activity oxygen is used to break down glucose into ATP molecules, providing sustained energy

            When lifting weights, the nervous system coordinates the firing of motor neurons, which stimulate muscle fibers to contract.Initially, muscle contractions are often partial and not strong enough to fully shorten the muscle cell.To achieve full muscle cell shortening and sustained contraction, the muscle cell must receive multiple signals in succession from the neuron.

       During workouts, the interaction between actin and myosin generates force in the muscle. Increasing the amount of actin and myosin results in greater force production and thicker, more defined muscles when lifting heavier weights.

         Consistent work out perform training, muscle fibers increase in size due to increased protein synthesis and the addition of contractile proteins actin and myosin. Aerobic exercise promotes mitochondrial growth within muscle cells. More mitochondria mean better ATP production through aerobic respiration.

     

 

 

 1.During her weightlifting workout, her muscles generate energy (ATP) primarily through a process called aerobic respiration, where oxygen is used to break down glucose into ATP molecules, providing the necessary energy for muscle contraction. Additionally, muscles could use stored energy in the form of creatine phosphate (CP). Another way that uses energy stored within carbohydrates from the blood or from muscle cell reserves to generate ATP.

2.During her workout, her nervous system sends signals to her muscle cells through neurons, triggering action potentials that result in muscle contraction. The frequency and intensity of these signals are adjusted by her nervous system to match the demands of the exercise.

However, this contraction isn't usually strong enough to fully shorten the muscle cell and it's more like a partial contraction.

To fully shorten the muscle cell and keep it contracted, it needs to receive multiple signals, one after the other, from the neuron. The more signals it gets in a row, the more the muscle cell shortens, and the longer it stays contracted.

When she workout, the pulling of actin by myosin provides force in her muscle, therefore adding more actin and myosin will get more force. That will also make your muscles thicker and appear more muscle when she continues lifting heavier weights.