Skeletal muscle development is one of the key features of childhood and adolescence. Muscle action determines the functional requirements that are imposed on other organ systems, such as lungs, heart, ...

Freehand sketching is the quickest way to capture initial design ideas on paper before they are forgotten, often done without rulers or templates. Annotation can be added to sketches to show key parts ...

Designers use many techniques to create products and solve problems. Sketches are used at the early stages with annotation to illustrate the designer’s thoughts. Development of the final design will ...