Urinary Bladder facts that you find here will spell out its anatomy and functions and of course, some fun facts that you should know. Before we move on with our facts list, it is imperative to say that we will be focusing on Urinary Bladder in humans and we will not go for other animals such as reptiles, mammals, birds, fish and amphibians. Covering everything is simply beyond the scope of this article. So let us begin…
Urinary Bladder Facts: 1-5 | What is Urinary Bladder?
1. The Urinary Bladder in humans is an organ. It is made of muscles and it is hollow by design. It is more like a sac.
2. The hollow design makes it work like a storage unit where urine is stored only to be disposed off at a later time. The urine it holds comes from the Kidneys and enters the Urinary Bladder through two tubes known as as Ureters (singular: Ureter).
3. The Urinary Bladder is very much like an elastic bag. In terms of biology, it is distensible. It sits on our pelvic floor right behind our pelvic bone.
4. In empty conditions, the Urinary Bladder resembles the shape of a pear. When the bladder is full, it takes an oval shape. As far as size is concerned, it is about 2 inches long. However, it can grow up 6 inches when full.
5. The amount of urine it can hold can range between 300 ml and 500 ml or 10.14 fluid ounces to 16.90 fluid ounces. However, the urge for urination occurs when the bladder is about one-quarter (1/4th) full. However, we hold urine for much longer than that.
Urinary Bladder Facts: 6-10 | How Does the Bladder Work?
6. When empty, the inner lining of the Urinary Bladder makes folds and tucks in. When urine fills in, the lining and hence the bladder expands to accommodate urine flowing in through the Ureters.
7. When empty the muscle walls of the bladder becomes thick and the whole organ becomes firm. However, this is only temporary.
8. The moment the Kidney process urine and send the liquid through the Ureters all the way down to the bladder, the muscle walls of the Urinary Bladder start thinning and the bladder starts expanding. One thing of note here is that the urine runs down the Ureters because of:
- Peristalsis – a wave-like movement of the Ureters.
9. As the bladder keeps expanding, it needs space. The growing bladder gradually moves upwards and fills in the space in the abdominal cavity.
10. There are two question that need to be asked. They are:
- Will the Urinary Bladder leak? No, not really no! The bladder has an internal muscular valve known as internal sphincter. It prevents leaking of the urine from bladder.
- Will the urine flow back into the Ureters? No, that’s not possible because of the shape of the bladder. It has a triangular shape which is known as ‘trigone’. This shape prevents urine from flowing back into the Ureters. To be more specific, there are two flaps covering the Ureteric Orifices (openings of the Ureters) preventing backward flow of urine known as vesicoureteral reflux. This trigone shape is also responsible for preventing the Urethra from stretching as well. Urethra is from where the urine flows out.