explain in short about four organ of human excretory system
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The excretory system is essential to one’s health. Its responsibility is to remove waste from the body. The excretory system is made up of numerous organs that work in unison to ensure that waste is effectively removed from your body. Below are the details of the organs of excretory system, along with the roles they play in detoxification.
Primary Excretory System Organs
1. Kidneys
Kidneys are bean-shaped organs of a reddish brown color that are found in the sides of the vertebral column. Once the body has extracted what it needs from food and drink, it sends the wastes to the kidneys. The kidneys filter the wastes, including urea, salt and excess water, which are flushed out of the body as urine.
2. Skin
The skin performs its excretory function via the sweat glands. These glands produce sweat that contains salt, excess oils, water, and other unnecessary substances which are then excreted out of the body through small pores. Sweating also helps to cool the body during evaporation.
3. Lungs
The lungs are very important excretory organs as they expel carbon dioxide from the body via exhalation. The lungs use cells known as alveoli to remove the carbon dioxide from our blood. Otherwise, the carbon dioxide would accumulate and have a detrimental effect to our body.
Accessary Excretory System Organs
1. Liver
Although considered a secondary, or accessary excretory system organ, the liver plays a vital part in keeping the body clean. Harmful poisons and chemicals that are either produced in the body or consumed are broken down and detoxified by the liver. For example, a bi-product of the metabolic process within the body is ammonia and the liver processes this into urea, a less harmful substance which continues to be filtered and excreted by the kidneys as urine.
2. Gallbladder
Although the gallbladder does not have a highly significant role to play in the excretory system, it does have a function that assists the overall process. Bile, a liquid produced by the liver to break down waste, is first stored in the gallbladder. When needed, it is discharged into the small intestine whose role is to break down fats, ethanol and other acidic wastes.
3. Urinary Bladder
The waste fluid that is created in the liver and collected in the kidney is transferred into the urinary bladder where it is temporarily stored until the individual urinates. The urinary bladder provides a short term solution for storing urine in the body until it is ultimately discharged.
4. Ureters
The ureters tubes of smooth muscle fiber transfer liquid waste from the kidneys into the urinary bladder. The urine is moved with peristaltic movements which force the urine away from the kidneys. The ureters also have ureterovesical valves which ensure the waste fluid does not travel back into the kidney.
5. Urethra
The urethra runs through the penis in males, and serves as a carrier of semen as well as urine for their ultimate .
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Organs of excretion include the skin, liver, large intestine, lungs, and kidneys (see the figure below). Together, these organs make up the excretory system. They all excrete wastes, but they don’t work together in the same way that organs do in most other body systems. Each of the excretory organs “does its own thing” more-or-less independently of the others, but all are necessary to successfully excrete the full range of wastes from the human body.
Internal organs of excretion are identified in this general illustration of human anatomy. They include the liver, large intestine, lungs, and kidneys.
Skin
The skin is part of the integumentary system, but it also plays a role in excretion through the production of sweat by sweat glands in the dermis. Although the main role of sweat production is to cool the body and maintain temperature homeostasis, sweating also eliminates excess water and salts, as well as a small amount of urea. When sweating is copious, as in the figure below, ingestion of salts and water may be helpful to maintain homeostasis in the body.
The purpose of sweat production is mainly to cool the body and prevent overheating, but it also contributes to excretion.
Liver
The liver (shown below) has numerous major functions, including secreting bile for digestion of lipids, synthesizing many proteins and other compounds, storing glycogen and other substances, and secreting endocrine hormones. In addition to all of these functions, the liver is a very important organ of excretion. The liver breaks down many substances in the blood, including toxins. For example, the liver transforms ammonia — a poisonous by-product of protein catabolism — into urea, which is filtered from the blood by the kidneys and excreted in urine. The liver also excretes in its bile the protein bilirubin, a byproduct of hemoglobin catabolism that forms when red blood cells die. Bile travels to the small intestine and is then excreted in feces by the large intestine.
The liver and large intestine are two of the major organs of excretion.
Large Intestine
The large intestine is an important part of the digestive system and the final organ in the gastrointestinal tract (see figure above). As an organ of excretion, its main function is to eliminate solid wastes that remain after the digestion of food and the extraction of water from indigestible matter in food waste. The large intestine also collects wastes from throughout the body. Bile secreted into the gastrointestinal tract, for example, contains the waste product bilirubin from the liver. Bilirubin is a brown pigment that gives human feces their characteristic brown color.
Lungs
The lungs are part of the respiratory system (shown in the figure below), but they are also important organs of excretion. They are responsible for the excretion of gaseous wastes from the body. The main waste gas excreted by the lungs is carbon dioxide, which is a waste product of cellular respiration in cells throughout the body. Carbon dioxide is diffused from the blood into the air in the tiny air sacs called alveoli in the lungs (shown in the inset diagram in the figure). By expelling carbon dioxide from the blood, the lungs help maintain acid-base homeostasis. In fact, it is the pH of blood that controls the rate of breathing. Water vapor is also picked up from the lungs and other organs of the respiratory tract as the exhaled air passes over their moist linings, and the water vapor is excreted along with the carbon dioxide. Trace levels of some other waste gases are exhaled, as well.
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