As slabs shrink due to cooling and drying, shrinkage or tensile stresses start building and cracks form at contraction joints because the concrete is weaker or thinner at these locations.

When muscle cells are viewed under the microscope, one can see that they contain a striped pattern (striations). This pattern is formed by a series of basic units called sarcomeres that are ...

Muscular contractions are defined as the change in the length of the muscle under contraction. Muscles contract in different ways to produce a range of movements: Isotonic contraction – involves ...

Isotonic contractions – these occur when a muscle contracts and changes length and there are two types: Isotonic concentric contraction – this involves the muscle shortening. The origin and ...