Concept Quiz

Glycogen is the primary substrate used in this early phase of exercise as glycogenolysis will liberate glucose for easy metabolism.

A combination of fat oxidation and glucose metabolism (anaerobic glycolysis and minimal oxidation) occurs as ATP and PCr stores dissipate - glucose metabolism is the primary physiological process during this stage of exercise. (correct)

Fat oxidation as oxidation of this substrate provides the most amount of energy

ATP and Phosphocreatine are the sole substrates used during this early stage of exercise as they are readily available or only require a single reaction to liberate ATP (respectively).

Changes in the ATP:ADP ratio results in activation of pyruvate dehydrogenase kinase which activates pyruvate dehydrogenase

Pyruvate dehydrogenase is activated directly by a reduction in calcium concentration as calcium is used up in cross-bridge cycling

It is activated indirectly by calcium concentration increase during skeletal muscle contraction, which results in phosphorylation of pyruvate dehydrogenase.

Pyruvate dehydrogenase is active in it's dephosphorylated form which occurs through activation of Pyruvate Dehydrogenase Phosphatase. (correct)

Glycogen is a primary fuel source during high intensity, longer duration exercise (correct)

Anaerobic metabolism is unlikely to contribute to ATP production after the first 7 minutes of exercise

Aerobic metabolism is the primary source of ATP during the first few seconds of exercise

The body preferentially oxidises fat during high intensity exercise

<p>ROS overproduction is necessary for stimulating mitochondrial biogenesis</p> Signup and view all the answers

<p>Mitochondrial Fusion which describes a process where damaged mitochondria share complementary DNA to produce a functioning mitochondrion.</p> Signup and view all the answers

<p>Increased stroke volume</p> Signup and view all the answers

<p>Within two to three weeks of exercising in the heat</p> Signup and view all the answers