Usually the secondary bundles form radial rows in the secondary tissue.
Fern stems never become woody (composed of secondary tissue containing lignin), because all tissues of the plant body originate at the stem apex.
As conditions worsen, the radial diameters of the secondary tissue cells decrease and the walls may thicken, and the wood may take on the appearance of latewood.
In leaning trees with secondary tissue (wood), the cambium produces compression wood on the lower side (in conifers) or tension wood on the upper side (in dicotyledons) in response to a hormone; the stem responds by pushing (in conifers) or pulling (in dicotyledons) itself upright.
Along the longitudinal axis of a root, beginning with the root cap and leading away from the root tip, there are five distinct zones in which certain specific growth patterns dominate: cell division, cell elongation, primary tissue maturation, mature primary tissues, and secondary tissue growth (the latter is found in woody roots i.e., those of perennial dicotyledons).
Their invention, which they describe in Biomaterials, is a lab-on-a-chip that mimics the metastasis of breast cancer into bone marrow.One of the mysteries of metastasis is why migrant cells from different sorts of primaries prefer to set up home in particular types of secondary tissue.
If cambial activity is extensive, the primary tissues lying outside the cambium, such as primary phloem, cortex, and epidermis, are crushed by the pressure of new secondary tissue growth or become torn and obliterated because they cannot accommodate the rapidly increasing diameter of the plant.
Thus, both an overwhelming inflammatory response and secondary tissue damage and cell dysfunction [9], and a decrease in the immune responses and inadequate infection control [8], could be associated with sepsis pathogenesis [9].
The reporting radiologist should be aware of the substantial secondary tissue damage caused by in-driven fragments of bone and teeth, which themselves become secondary projectiles (Figs. 12a c and 13a, b).
Again, these results are consistent with shock and hypoxic secondary tissue injury.
Theoretically, inflammation-blocking interventions may reduce the "secondary" tissue damage and the possibility for fibrosis and scarring.
