Biology – Homeostasis in mammals | e-Consult

Micrograph 1 Answer:

Glomerulus: The glomerulus appears as a network of tightly packed fenestrated capillaries. The fenestrations are small pores that allow water and small solutes to pass through. The endothelial cells lining the capillaries are also thin, further facilitating filtration. The basement membrane is a thick, specialized membrane that acts as a further filtration barrier.

Bowman's Capsule: Bowman's capsule is a cup-shaped structure surrounding the glomerulus. It is formed by two layers of cells: a parietal layer and an inner layer. The parietal layer is derived from the mesenchyme and provides structural support. The inner layer is derived from the epithelial cells of the nephron. The capsule collects the filtrate from the glomerulus.

Contribution to Filtration: The combination of fenestrated capillaries, thin endothelial cells, and a basement membrane allows for the filtration of water, ions, glucose, amino acids, and urea from the blood into the Bowman's capsule. The size selectivity of the filtration process prevents the passage of large proteins and blood cells.