Muscle cells are also known as muscle fibres. A muscle fibre is made up of myofibrils. The myofibrils are made of many myofilaments. When myofilaments are stimulated by a nerve impulse they slide over each other contracting or shortening the muscles.
Muscle becomes shorter and thicker during contraction... so what?!!! (help me!!!)
the nerves in our muscles gives a message and thats how muscles go thicker and shorter
When a bicep contracts it pulls on tendons causing the arm to bend at the elbow.
When the muscle contracts, it gets shorter. When it relaxes, it gets longer.
When a muscle becomes shorter and thicker, it is called muscle hypertrophy. This occurs when the muscle fibers increase in size in response to repetitive, strenuous exercises like weightlifting.
A boys muscles and penis become thicker once he has begun puberty.
Since muscles cannot do work by "expanding", they are arranged in pairs, pulling in opposite directions. When one muscle of a pair contracts, the other relaxes. This generates movement in the desired direction.
Compression
yes
The part of the eye that becomes thicker and thinner to allow us to see at varying distances is the lens. It changes shape through a process called accommodation, which helps focus light onto the retina for clear vision.
UPSET
No it just make your hair shorter. :D