What is the name of the theory muscle contraction illustrated in the transparency?

Answer 1

In short, the basic contraction unit of the muscle is the sarcomere. Many sarcomeres work serially and in parallel to acheive the full contraction ability of the muscle. The sarcomere is made up of many filaments of Actin and Myosin, two types of protein based filaments that reach out towards each other from opposing sides of the sarcomere. When the muscle is at rest, the Actin and myosin filaments overlap each other the least. In order for the muscle to contract, the filaments from the opposing sides slide over each other thus pulling both walls of the sarcomere towards each other, with them. When the muscle is fully contacted, the filaments overlap each other the most. The sliding motion is activated by calcium that floods the sarcomeres (at the end of a process that is triggered by a command from a motor nerve). The calcium reveals sites on the Actin filaments at which molecular 'whips' extending from the Myosin filaments, can throw themselves, attach, pull, and leave, using the muscle's energy reserves in the process. Each molecular whip works at its own time (much like cylinders in an internal combustion engine), so that in any given time, contact between the filaments is being made by some of the whips.

Answer 2

Muscle contraction is based on the following theories (1) cross bridge theory, (2) the Sarcomere Length Nonuniformity Theory, (3) Residual Force Enhancement Theory, and (4) sliding filament theory.

These theories are quite connected in their mechanism, which means that we cannot really debunk one theory over the other.

Answer 3

You start falling asleep, or your body starts shutting down and your brain is trying to wake up your body so it creates a muscle contraction.

Answer 4

Sarcomeres.

They are units composed of actin and myosin that contract inside the muscle fiber.

Answer 5

Sliding Filament theory

Answer 6

It is called the sliding filament model.

Answer 7

Sliding Filament Theory.