Which of these structures is least permeable to passage of material across the filtration membraneChoose from the following:(A) arrows - fenestra of the capillary endothelium(B) arrowhead - filtration slit bridging the gap between the pedicels This image is an electron micrograph showing structures likely related to cellular components, possibly cilia or a similar organelle.Key Features:1. **Hair-like Structures**: There are numerous protrusions or finger-like extensions, marked with asterisks (*), which could represent cilia or microvilli. These structures are densely packed and appear to have a textured surface.2. **Arrows and Arrowheads**: - **Solid Arrows**: These point to the base or the insertion point of the protrusions, possibly indicating important attachment sites or basal bodies. - **Arrowheads**: These are positioned at the boundary or junction between protrusions, potentially highlighting the separation or points of contact between adjacent structures.3. **Dotted Box**: A rectangular area is highlighted with a dotted line. This area might be of particular interest, possibly showing a specific interaction or feature of the structures within it.Understanding these structures can be significant in studying cell morphology, function, and communication.

Nephrons are the functional as well as structural units of kidneys. The primary function of the nephron is to eliminate excess nutrients and possible toxins in the urine while maintaining homeostatic blood plasma balance. The filtration membrane of each nephron is made up of fenestrated endothelium of the glomerulus, a basement membrane on which endothelium lies, and the podocytes of Bowman's capsule. Fenestrated capillaries are located in the glomeruli of the kidney and have intracellular perforations known as fenestrae. They have grater permeability compared to continuous capillaries. In the glomerulus, podocytes are arranged in a complex pattern to leave very small openings known as filtration slits. Filtration slits are the gaps between the pedicels and are only permeable to the micro molecules like as water, ions, glucose, and salts. The slits are protected by slit diaphragms, which are made up of a variety of cell-surface proteins include podocalyxin nephrin and P-cadherin. These proteins prevent the passage of big macromolecules like albumin serum and γ globulin and ensure that they present in the bloodstream. Only the micro molecules easily pass through the filtration slits and form an ultrafiltrate in the tubular fluid. Thus, the fenestrated slits are least permeable to the passage of the nutrients. Correct answer-(B) arrowhead - filtration slit bridging the gap between the pedicels.