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Micturition is the process of urine excretion from the urinary bladder.

Micturition is the process of urine excretion from the urinary bladder.

The micturition process contains two phases – the storage phase and the voiding phase.

The storage phase is characterized by the storage of urine by the urinary bladder. The movement is controlled by the circular sphincter muscles.

The voiding phase is said to occur when the brain sends signals to begin urinating until the bladder becomes empty.

Excretion is a life process which is as important as nutrition. In animals, including humans, as a part of metabolism, many waste products are produced. Animals excrete them in different forms, such as urine, sweat, faeces, and tears. Among these, the usual form of excreta, urine, is produced and discarded from our body as fluid. Let us explore the different stages of micturition and its physiology.

“Micturition is the process of discharging urine from the urinary bladder.” 

Micturition is a process where urine is expelled from the body. Animals and humans have a specialised system of organs known as the excretory system to eliminate the waste products from the body. In other words,  the process of expelling urine from the body is called micturition. The  human excretory system  consists of a pair of kidneys and ureters, a urinary bladder, and a urethra. The kidneys play a major role in the process of urine formation and its excretion. The urine formed is stored in the urinary bladder. As the bladder becomes full, the stretch receptors increase their firing rate. This increase the urge to urinate and causes micturition reflex. It sometimes even causes involuntary urination. Micturition is also termed as the voiding phase to expel the stored urine. Also Read:  Excretory Products and their Elimination

On average, a normal adult excretes 1 to 1.5 L of urine per day. Normal human urine is a light yellow fluid majorly consisting of 95 per cent water and 5 per cent solid wastes. It is slightly acidic with a pH close to 6. Many endocrinal disorders can be diagnosed through urine analysis. For example, if a patient has diabetes, the presence of glucose and ketone bodies in the urine can help detect the disease. Thus it is a major clinical diagnostic element. Also Refer :  Urine Formation And Osmoregulation

Micturition process consists of two phases:

The urinary bladder is a balloon-shaped, hollow, muscular, organ that acts as the storage organ for urine. The urinary bladder in a healthy urinary system can store up to 16 ounces of urine for 2 to 5 hours easily. The circular sphincter muscles prevent leakage of urine. They tightly close around the opening of the bladder into the urethra, that allows the passage of urine outside the body.

When the bladder is filled with urine, the nerves in it are triggered and there is an urge to urinate. The brain signals urinary bladder to contract. The receptors of the urinary bladder send a signal to the  central nervous system , in response to which the nervous system sends a signal that incites the contraction of the urinary bladder.  Through the urinary opening at the urethra, the urine is eliminated, and the process is called micturition. The neural mechanism involved is called the micturition reflex. Also Read:  Urine Infection Symptoms

There are several factors which affect the process of micturition. Some of these can be due to physical trauma or disease; others are psychological in nature. Following are a few disorders that affect micturition:

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