Select all of the following aspects that are present in fast-twitch muscle fiber

Question

Select all of the following aspects that are present in fast-twitch muscle fibers: O Rich in capillary supply O High levels of myoglobulin Gmproves oxygen delivery) & High anaerobic capacity Ti Att Rich in mitochondria O Present in sprinters D Question 2 10 pts Sort the following steps in the order in which they occur during muscle contraction (starting with the nerve impulse releasing neurotransmitters at the muscle junction): I Choose 1 Myosin heads form cross-bridges with actin filaments Tropomyosin is displaced, exposing myosin-binding sites on actin Depolarization of the T tubules Calcium ions bind to the protein troponin Calcium channels in the sarcoplasmic reticulun to open Depolarizatión of the T tubules Myo

Explanation / Answer

1) Fast-twitch muscle fibers have a high anaerobic capacity & They are present in sprinters

they are not rich in mitochondria, have less myoglobin, not rich in capillary supply

2) After the nerve impulse releasing neurotransmitters at the muscle junction, the steps involved in order are

- Depolarization of T- tubules

- Calcium channels in the sarcoplasmic reticulum to opens

- Calcium ions bind to protein troponin

- Tropomyosin is displaced, exposing myosin binding sites on actin

- Myosin filaments form cross bridges with actin filaments

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