Chapter 3 — Bioenergetics (14 cards)

Which of the following substances can be metabolized anaerobically?

Glucose

An athlete changes from high-intensity aerobic exercise to longer-duration, submaximal exercise. What change in energy supply typically occurs?

A transition from using almost exclusively carbohydrate to mostly fat

Which of the following is a branched-chain amino acid?

Isoleucine

During higher-intensity exercise, athletes often experience peripheral fatigue. What is believed to cause this type of fatigue?

Metabolic acidosis

The Krebs cycle occurs in which portion of the cell?

Mitochondria

Which reaction is the primary cause of metabolic acidosis (decreased intramuscular pH) during high-intensity exercise?

ATP → ADP + Pi + H+

Which energy system produces ATP at the quickest rate?

Phosphagen system

Which energy systems will a weightlifter and a marathon runner primarily use, respectively?

Phosphagen system; oxidative system

What does PFK stand for?

Phosphofructokinase.

What role does PFK play in fast glycolysis?

It is the primary rate-limiting enzyme.

Which substances inhibit PFK, according to these notes?

ATP, creatine phosphate (CP), citrate, and low pH.

What does isocitrate dehydrogenase regulate in these notes?

The Krebs cycle; it is the cycle’s primary rate-limiting enzyme.

What stimulates isocitrate dehydrogenase?

Elevated ADP.

What inhibits isocitrate dehydrogenase?

High ATP.