Excretory System

The excretory system consists of the urinary system and the sweat glands. 

The urinary system

The urinary system is formed by the kidneys, the ureters, tha bladder and the urethra. The filtered waste substances in the kidneys are mixed with water to make urine. This leaves the kidneys through the ureters and accumulates in the bladder. When the bladder is full, urine is expelled from the body through the urethra. 

Do you want to know more about waht water does in our body? Check this link to find out water journey in the body. It's very interesting!

Kidneys

They filter the blood and also clean it. 

Sweat glands

We sweat when we do exercise or sports, when it is hot and also when we get nervous. Sweat is a mixture of water and waste substances. But it has also many more things.

What your sweat is composed of depends on which gland the sweat is coming out of. There are many different types of glands on the human body, but generally, only two main ones are recognized:

Eccrine glands produce most of your sweat, especially the watery kind. But eccrine perspiration doesn’t taste like water, because bits of salt, protein, urea, and ammonia gets mixed into it. These glands are mostly concentrated on the palms, soles (plantas de los pies), forehead, and armpit, but cover your entire body.

Apocrine glands are larger. They’re mostly located on the armpits (axilas), groin (ingle), and breast area. They’re the ones most often associated with BO and produce more concentrated secretions after puberty. Since they’re near hair follicles, they typically smell the worst. This is why people often say stress sweat smells worse than other types of sweat.

The functions of sweat glands are the following:

1. To filter the blood.
2. To control body temperature.