The transport of substance A from peritubular capillary into the fluid of renal tubule is Tubular secretion.
What is Tubular secretion?
Tubular secretion is the phenomenon of transfer of materials from peritubular capillaries to fluid of renal tubule. It is basically a process of toxins removal from blood capillaries and tissues and their active secretion into the nephrons. The nephrons are surrounded by peritubular capillaries and the exchange between nephron and blood occurs via peritubular capillaries. The tubular secretion is most active in proximal convoluted tubule (PCT). Tubular secretion is an important parameter for measuring kidney function and excretion process. It also maintains the blood pH.
Hence, the substance A that is transported from plasma of peritubular capillary into fluid of reanl tubule is said to be secreted.
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Answer:
The three basic units of DNA are phosphate, deoxyribose and nitrogen base.
nitrogen base (adenine, thymine, cytosine and guanine)
There are two main reasons why cells divide rather than continuing to grow larger and larger: ... more demands the cell places on its DNA. If the cell grows too large, it will have trouble moving enough nutrients and wastes across the cell membrane.
