Histology

graph TD
    A[Cells] --> B[tissue];
    B --> C[organ];
    C --> D[human];

Types of Cells

graph TD
    A[Epithelium];
    B[Connective ];
    C[Nervous ];
    D[Muscle ];
    X[Organ]
    A -->X
    B -->X
    C -->X
    D -->X