The air sacs, which hold air, do not contribute much to gas exchange, despite being thin-walled, as they are poorly vascularised.
12.
These cells are arranged into a complex 3-D network and surround a system of highly vascularised and arbourised fibrous cords which run throughout the structure.
13.
Although not true pulmonates, some operculate land snails, such as the Cyclophoridae have also lost their gills, and developed a vascularised lung from the mantle cavity.
14.
Simple, vascularised leaves ( microphylls ) first evolved as enations, extensions of the stem, in clubmosses such as " Baragwanathia " during the Silurian period.
15.
Although the swim bladder is not highly vascularised, it can absorb oxygen from air and also functions to produce sound by squeezing air through a narrow passage into the pharynx.
16.
Rather than using lungs " Gaseous exchange takes place across the surface of highly vascularised gills over which a one-way current of water is kept flowing by a specialised pumping mechanism.
17.
The seed megaspore was surrounded by two layers of tissue : a vascularised nucellus and a usually three-layered integument; the nucellus and integument were completely free except at the base of the ovule.
18.
Rather than using lungs, " [ g ] aseous exchange takes place across the surface of highly vascularised gills over which a one-way current of water is kept flowing by a specialised pumping mechanism.
19.
However, it is generally agreed that endothermy first evolved in non-mammalian synapsids such as dicynodonts, which possess body proportions associated with heat retention, high vascularised bones with Haversian canals, and possibly hair.
20.
In premature babies, signs of damage to the eye ( retinopathy of prematurity, or ROP ) are observed via an ophthalmoscope as a demarcation between the vascularised and non-vascularised regions of an infant's retina.
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