Common pairs of antagonist and agonist muscles exist. In the upper body, the biceps and triceps work to complete actions related to movement of the arm. The quadriceps and hamstrings in the upper leg work to help move the knee joint and perform exercises, such as squats and leg extensions.
Definition of lattice for Students. 1  1 : a structure made of thin strips of wood or metal that cross each other. 2  2 : a window or gate having a lattice.
Basis and Crystal Now one could go ahead and replace the lattice points by more complex objects (called basis), e.g. a group of atoms, a molecule, ... . This generates a structure that is referred to as a crystal: [11] [12] [13] [14] A crystal is defined as a lattice with a basis added to each lattice site. Usually the basis consists of an atom, a group of atoms or a molecule. For many solids it is a good approximation to look at them as crystals since they consist of small groups of atoms that are arranged in a repetitive manner.