Topics:
Animal Physiology, Animal Refresher
Animal Lacking Urinary Bladder
Urinary bladder is absent in:
- Horse
- Fowl — Correct Answer
- Camel
- Both horse & camel
Explanation:
Correct Answer: Fowl
The urinary bladder is absent in fowl (birds). Unlike mammals, birds have no urinary bladder. Urine passes directly from the ureters into the cloaca and is then refluxed into the colon for post-renal modification.
Comparison Table: Urinary Bladder Presence
- Birds (fowl): Urinary bladder ABSENT
- Horse: Urinary bladder PRESENT (horse urine has a thick & syrupy consistency due to mucus and calcium carbonate crystals)
- Camel: Urinary bladder PRESENT
- Most mammals (cattle, sheep, goat, dog, pig): Urinary bladder PRESENT
Other Absent Organs in Specific Animals
- Gall bladder absent in: Horse, all pseudo-ruminants (camel, llama, alpaca, vicuna)
- Diaphragm absent in: Birds
- Omasum absent in: Pseudo-ruminants (camel, llama, alpaca, vicuna)
Why Birds Lack a Urinary Bladder
An adaptation for weight reduction during flight. Storing liquid urine in a bladder would add significant weight. Instead, birds produce semi-solid urine (uric acid paste) that is eliminated immediately with feces through the cloaca.
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
