Vertebrate kidney, Biology

Vertebrate Kidney

Typically, all vertebrates have a pair of kidneys, which function on the filtration - reabsorption - secretion principle. Only in a few teleost fishes, the kidney is aglomerular (without a glomerulus) and functions on the absorption - reabsorption - secretion principle as in the malpighian tubules of insects. The functional unit of the vertebrate kidney is the nephron or the uriniferous tubule. A small fish may have only a few dozen nephrons in its kidneys; a large mammal may have several million.  A mammalis nephron begins with the renal corpuscle or the Malpighian body which consists of a double-walled cup, the Bowman's capsule, enclosing a knot of blood capillaries called glomeplus.

359_Vertebrate Kidney.png

Figure:  Schematic diagram of mammalian kidney and nephoron

Blood is brought to the kidney by the renal artery which branches and sub-branches into interloper arteries and finally into the afferent arteriole which gives rise to the capillary network of the glomerulus. An efferent arteriole formed by the confluence of the capillaries takes blood away from the Bowman's capsule. The Bowman's capsule latter continues into a long convoluted tubule which is distinguished into the proximal and distal convoluted tubules respectively. The distal convoluted tubules from different nephorons join to form the collecting tubule which carry the urine into the renal pelvis from where the ureter starts. The proximal and distal tubules are present in all vertebrates, but in birds and mammals a new U-shaped hair-pin-like segment called Henle's loop is present between proximal and the distal tubules. In the following section we shall study structural variations in the vertebrate kidney.

Posted Date: 1/16/2013 1:49:53 AM | Location : United States







Related Discussions:- Vertebrate kidney, Assignment Help, Ask Question on Vertebrate kidney, Get Answer, Expert's Help, Vertebrate kidney Discussions

Write discussion on Vertebrate kidney
Your posts are moderated
Related Questions
DNA sequencing is the process of reading the nucleotide bases in a DNA molecule. It includes any technology or method which is used to verify the order of the four bases- guanine,

How do placental mammals reproduce? Placental mammals reproduce sexually, they have internal fecundation and they are viviparous, i.e., their embryo creates within the mother's

OBJECTIVES :  After reading surgery, you will be able to: 1 understand the fundamental of closed and open heart surgery and recent developments in off pump surgery; 2 in

Q. Why is it not correct to assert that the DNA self- replicates? The DNA is not completely self-sufficient in its duplication process because the replication does not occur wi

Head stream of Highland brook zone This is formed by a number of small streams, which originate from a marsh, a spring or a glacier. This is a small shallow zone with an irreg

Q. What are some examples of migratory animals? Instance of the migratory animals are southern right whales from Antarctica, that procreate on the Brazilian coast; the migrator

Humans have selectively bred many radically different domestic animals(e.g., St. Bernard and Chihuahua dog breeds). Does this activity result in evolution? why or why not?

Uses of Grafting Grafting helps to preserve and perpetuate varieties that cannot reproduce by vegetative method. Grafting changes less useful varieties to more desirable

Calculate the diffusion coefficient of a protein bovine serum albumin at 23 degree Celsius?

WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL