Excretion in human digestive system

            Excretion in human

The process of removing wastes from the body is called excretion.

 In other processes like 

1) Respiration 

2) Transportation

3) Nutrition

4) Organisms use different strategies to do excretion

 It's different in the case of unicellular organisms .Wastes are removed from the cell surface into the surrounding water by the process called diffusion. But in case of multicellular organisms, it differs greatly. Excretion or getting rid of waste products is an essential process that helps maintain homeostasis within even complex mammalian systems. There are numerous respects in which the excretory system benefits this complex animal group.

Not only does excretion help through the elimination of harmful metabolic wastes, but it also plays a critical role in temperature regulation within tissues, bone development and maintenance, blood acid-base balance, water balance maintenance and osmoregulation, waste product removal from the circulatory system, and even immune response execution. From this point of view then, humans deserve an exceptional approach. 

kidneys consists of one a pair of kidneys 

1) Right Kidney

2) Left Kidney

A pair of ureters

1) Right diorite

2) Left ureter

Three a urinary bladder for a urethra kidneys are located in the abdomen on either side of the backbone kidney is a basic filtration unit. it consists of very thin wall blood capillaries each capillary cluster is  associated with cup-shaped end of a tube that collects filtered urine. Each kidney has large number of filtration units called nephrons. Pack close together the waste products are nitrogenous wastes that are collected from the blood in the form of urine. The produced urine passes through ureters into urinary bladder the urine is stored in the urinary blood.

Urine is released to outside through urethra .Urine formation takes place in three steps

1) Filtration

2) Reabsorption

3) Secretion filtration the nitrogenous wastes

Uric acid are removed from blood in the kidneys. The process of uric formation takes place in nephron reabsorption. some substances like glucose, amino acids, salts, water which are filtered along with nitrogenous wastes. 

Urine formed in kidney enters into a lung tube called ureter. The one end of the ureter is connected to kidney and the other end is connected to urinary bladder. Urine is stored in the urinary bladder until the pressure of urinary bladder. Urine when it reaches the pressure to urge to pass it urine passes out through urethra how can we hold urine until it reaches to the urge to pass urine as urinary bladder is

muscular and it is under the control of nervous system.

We can usually control too to urinate the process of passing up urine is called as urination.