Extra-embryonic Membranes
This membrane forms a fluid-filled sac that cushions the developing embryo.
Amnion
Embryonic Development refers to these months.
Months 1 and 2.
The smallest functional unit of the kidneys.
Nephron
Tubular epithelia that are outpocketed extensions of the gut itself, found in arthropods.
Malpighian Tubules
This outermost membrane lies just beneath the shell in reptiles and birds and contributes to placenta formation in mammals.
The chorion.
Foetal development refers to these months.
Months 3 to 9.
The main organs of the excretory system (Four)
-Kidneys
-Ureters
-Urinary Bladder
-Urethra
Organisms such as the flatworms have this excretory system consisting of two tubules connected to a highly branched duct.
Protonephridia.
This membrane is responsible for the early transfer of nutrients in birds and reptiles and forms part of the gut in humans.
The yolk sac
The embryo is referred to as this on the third day, following several cleavages.
Morula
The outer part of the kidneys is called this.
The renal cortex.
Specialised cells found in the tubules of protonephridia.
Flame cells
The chorion secretes this hormone when it becomes the mother's part of the placenta.
HCG
The morula becomes this on the fifth day.
Blastocyst
The inner part of the kidneys is called this.
The renal medulla
Earthworms have more evolved excretory structures as compared to flatworms, called this.
Metanephridia.
In human embryos, the yolk sac produces these two types of cells.
Germ Cells
A phase where a single-layered blastula transforms into a multi-layered structure called the gastrula. (Third week)
Gastrulation
The unit formed by the Bowman's capsule and glomerulus.
Renal Corpuscle
Excretion occurs through a pore called this.
Nephridiopore