Question

how do muscles work ?



necert book question evs
​

Answer 1

Muscles. Muscles are attached to bones by tendons and help them to move. When a muscle contracts (bunches up), it gets shorter and so pulls on the bone it is attached to. ... Therefore muscles have to work in pairs to move a joint.Muscles allow us to consciously move our limbs, jump in the air, and chew our food.
But they are also responsible for many more processes that we cannot actively control, such as keeping our hearts pumping, moving food through our guts, and even making us blush.
Our muscles need signals from our brains and energy from our food to contract and move.
To build new muscles through exercise, we make use of their remarkable ability to repair themselves when damaged.


hope this helps you

please Mark's as brainlist

Answer 2

In general, muscles work when calcium ions are released, which triggers muscle cells to contract. The contracting muscles pull on tendons, which in turn pull on the bones to which they are attached.

Proteins called "actin" and "myosin" form filaments, which form crossbridges during contraction. The actin and myosin filaments pull past each other when a flood of calcium ions signals contraction, and this causes the muscle sheath to become shorter. This leads all the sheaths (called "sarcomeres") to shorten, and the contraction is synchronized across the entire muscle. All muscle contractions are triggered by electrical impulses which travel from your brain to the nerve endings in contact with the actin and myosin filaments.