Question

The excitation, contraction, and relaxation of skeletal muscle require the use of ATP. Because only limited stores of ATP are immediately available in muscle tissue, ATP must be continually supplied if contractile activity is to continue.

Depending on the type of movement or exercise, one or more pathways can be used to provide the most efficient way of supplying the ATP.

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For example, a friend of yours goes to the gym and takes a 30-minute, cardio interval training class. While switching between doing high-intensity push-ups, jumping jacks, and weight training, she notices that there is a burning sensation in her muscles.

The burning is due to the buildup of

a.creatine phosphate

b.lactate

c.alcohol

in the muscle tissue, a result of her muscles supplying ATP   .

a.anaerobically

b. aerobically

What is true about this pathway for forming ATP? Check all that apply.

a.This pathway typically utilizes creatine phosphate supplies to provide short bursts of high-intensity contractile effort.

b.Known as glycolysis, this pathway is ideal for endurance-type exercises, where glycogen stores are slowly and steadily depleted to provide a consistent rate of ATP production.

c.This pathway is typically used when oxygen delivery or oxidative phosphorylation capacity is exceeded.

d.Compared to oxidative phosphorylation, this pathway can generate ATP more rapidly but also depletes glycogen stores more rapidly.

Answer 1

Before going to know the answers shall we discuss about the energy sources for muscles during its contractions.

Usually muscle fibers stores some sort of ATP. This ATP is utilised at the initial stages of muscle contraction. Later on muscle uses other sources for energy.

Next source is creatinine phosphate.

Creatine phosphate is a molecule that can store energy in its phosphate bonds.

In a resting muscle, excess ATP transfers its energy to creatine, producing ADP and creatine phosphate. This acts as an energy reserve that can be used to quickly create more ATP.

When the muscle starts to contract and needs energy, creatine phosphate transfers its phosphate back to ADP to form ATP and creatine. This reaction occurs very quickly; thus can only provide approximately 15 seconds worth of energy.

Then muscle goes to glycolysis process.

Glycolysis is an anaerobic process that breaks down glucose (sugar) to produce ATP; however, glycolysis cannot generate ATP as quickly as creatine phosphate. Glycolysis produces ATP and lactic acid. This lactate makes the muscles get fatigue and burning.

Answers:-

1. The burning is due to buildup of lactate

2. In the muscle tissue, a results of her muscles supplying ATP anaerobically.

3.b.Known as glycolysis, this pathway is ideal for endurance-type exercises, where glycogen stores are slowly and steadily depleted to provide a consistent rate of ATP production.