What is Micturition?
Micturition Excretion is the process of removal of chemical wastes( mainly nitrogenous wastes) from the body. It plays a vital role in maintaining the homeostatic( steady-state) condition of the body and organs concerned with the formation, storage and elimination of urine constitute are ” excretory system ” (the urinary system is more appropriate than the excretory system for the removal of nitrogenous wastes product) Micturition Meaning: It’s the process of discharging urine from the urinary bladder along the urinary tract from the body. What is Micturition? Micturition is the process of discharging urine from the human body. Human beings and animals have a specialised organ system for the discharge of the urine from the body. Urine is expelled from the urinary bladder through the urethra( in the penis in males, and directly in females) by the relaxing of the sphincter muscles located at the opening of the urinary bladder into the urethra under the impulse from the nervous system. It also happens by relaxation of detrusor muscles after the voluntary relaxation of the sphincter muscles such a process is called Micturition Human beings and animals have an organised urinary system which consists of two kidneys ( right and left kidney located on either side of the backbone and protected by the last rib ), ureter, urinary bladder, sphincter muscles and urethra. Micturition is also known as the voiding phase of the bladder. It lasts for a short time, and as the bladder stretches, its firing rate increases and this increases the urge for urination and sometimes micturition relaxation; thus it is sometimes called involuntary Micturition or involuntary urination. [Image will be Uploaded Soon] Physical Properties Urine has a yellowish colour ( due to the presence of urochrome ), and also the colour varies with different diets. A healthy human beings urinate around 1 to 1.5 litres per day of urine but also varies with various conditions. Urine has a pH scale value between 5 to 8, i.e. it is slightly acidic ( pH scale value = 6) protein diet makes it acidic while vegetable diet makes it alkaline and on standing the smell of urine becomes strong, ammonium like due to bacterial activities otherwise faint smell and its specific gravity is 1.003 to 1.035 Constituents of Urines The normal human urine consists of about 95% of water and 5% of solid wastes dissolved in it. The percentage of solid waste may slightly vary according to the food taken and the time after taking food. Still, usually these are approximately ( in grams per litre in urine) as follows:
Besides the normal constituents, the urine may pass out specific hormones and also certain medicines like antibiotics and the excess vitamins. Micturition Process : Micturition process has two processes in it:
Storage Phase Urine is contained in the urinary bladder ( it acts as the primary storage organ ) is a balloon-shaped, hollow, muscular organ. A healthy urinary bladder can hold up to 16 ounces of urine for 2 to 5 hours easily, and there opening is tightly closed by sphincter muscles which also prevents the leakage of urine from urinary bladder and sphincter muscles facilitates the enter of urine from urinary bladder into ureter that allows the urine to pass outside the body Voiding Phase Whenever the urine is filled in the urinary bladder, it triggers the muscles and nerves, which in turn stimulates the need for urination and the brain signals the urinary bladder to contract. The responses sent to the central nervous system by nerves in the urinary bladder encouraged by the filling of urine in the urinary bladder and the answer sent back by the central nervous system to nerves in the urinary bladder signals the incitement of the contraction of the urinary bladder. Through the opening of the urinary bladder into ureter and the urine is eliminated and the process is called Micturition, and the neural mechanism involved is called the micturition reflex Problems Associated with Micturition There are many diseases related to the micturition process, and some of them are due to physical trauma or another physiological illness, and urination problems include initiating urination and bladder impairing bladder encrypting and urination inconvenience. Few of the diseased mentioned :
Management of the Micturition Problem:
Q1. Define the Process of Micturition? Ans. It’s the process of discharging urine from the urinary bladder along the urinary tract from the body. Q2. Mention any Three Disorders of Micturition Which Causes Urinary Incontinence? Ans. Three disorders of the Micturition are :
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