Define glycemic index (GI).

Explain glycogen use in type I and type II muscle fibres during exercise at low and high intensities.

Discuss the location and role of GLUT4 transporters in glucose uptake into a cell.

glycemic index (GI) is the ranking system for carbohydrates based on the immediate effect of the food on blood glucose concentrations <when compared with a reference food such as pure glucose> ✔

low-intensity exercise predominantly uses slow-twitch muscle fibres / less glycogen ✔

high-intensity exercise predominantly uses fast-twitch/type II muscle fibres / more glycogen ✔

Location: Sub max [1]

located in muscle fibres ✔

stored inside intracellular vesicles that are translocated to the cell membrane ✔

Role:

facilitates glucose uptake ✔

allows for greater glucose movement into the cell <than GLUT1> ✔