-Is the system of the body that is responsible for the function of excretion or the process of discharging wastes. Homeostasis produce a series of wastes that are eliminated by the excretory system.
Pathway:
It starts in the kidneys, where blood arrives by the renal artery that splits into different arterioles.These arterioles led to the nephrons, where wastes are taken of the blood by pressure filtration. After this, the capillaries that surround the nephron are in charged of taking substances in and out of the blood. The kidney has three major parts, the renal cortex is the outer layer and it is where ultrafiltration occurs. The renal medulla is the inner layer and contains the nephrons that are in charged of maintaining the water and salt balance of the blood. And the last part is the renal pelvis that is in charged of connecting the kidney with the ureter in order to the urine to be able to get to the bladder because the ureters are in charged of leading the urine into the urinary bladder. The urinary bladder is able to retain urine and to expand in order to be able to retain more urine, when it is full it send nerve impulses and expulses urine through the urethra out of the body.
The main structures are: -Kidneys: In charged of filtering the blood and taking out wastes. It is made up of nephrons that are the urine making cells, converting wastes into urine. All humans have 2 kidneys although people are able to survive with only one. Every kidney is made up of three main parts: 1. Renal Cortex 2. Renal Medulla 3. Renal Pelvis The kidneys maintain the homeostasis by controlling the excretion of substances out of the body. -Ureter: They are thin tubes in charged of transporting urine from the kidneys to the bladder. -Bladder: It is where urine is stored. When it fills up, the mammal eliminates the fluid. -Urethra: Where urine is expelled. -Sphincter: The muscles that help you contain urine in your bladder until you reach a bathroom. -Dorsal Aorta: The dorsal aorta is the main artery that carries blood all around the body, including excretory system, except lungs. -Posterior Vena Cava: The Vena Cava is the biggest vein in the body and it brings the deoxygenated from all the tissues of the body back to the heart. The posterior Vena Cava is the upper part of this vein and it brings blood back to the heart the deoxygenated blood from systems such as the excretory.
What Is A Nephron? It is a unit of the kidney in charged of controlling salts and water by filtering the blood. It eliminates wastes from the body, controls blood pressure and blood volume.
How and why is urine produced?
In a response to a stable internal organism, living organism must maintain homeostasis in terms of salt and water balance, this is why we continually remove the bad products that are generated by the metabolism. (sumanasinc)
Urine is made in the kidneys.
Urine is stored in the bladder.
The sphincter muscles relax.
The bladder muscle (detrusor) contracts.
The bladder is emptied through the urethra and urine is removed from the body.