AS2 CELLS IDENTITY

STOMATA

Protoxylem:

First formed – lignin laid down in annular or spiral thickening arrangement – this does not restrict elongation of xylem as growth takes place

Metaxylem: describe pattern reason

Mature parts – lignin arranged in a reticulate or pitted pattern. Pitted – contains pits to allow movement of water between adjacent vessels and cells, Pits - unthickened depression in a plant's cell wall. thin spots allow adjacent cells to communicate and exchange water, nutrients

Diastole atria ventricles

Atrail systoles

Ventricular systole

coordination of heartbeat

tissue fluid

Kingdom Prokaryotae characteristics

Kingdom Protoctista

Kingdom fungi