Which option correctly lists organs that are all part of the main human urinary system responsible for urine formation, storage, and transport?

Introduction / Context:
The urinary system is one of the major organ systems of the human body. Its job is to filter the blood, remove nitrogenous wastes, maintain fluid and electrolyte balance, and excrete urine. Understanding which organs belong to this system is basic but important general biology knowledge. This question asks you to identify the option that correctly groups together organs that all belong to the urinary system.

Given Data / Assumptions:

• The organs mentioned in the options are kidneys, urinary bladder, and ureters.

• You are expected to know the standard components of the human urinary system.

• It is understood that the urethra is also part of the system, but it is not listed as a separate option.

• The question focuses on whether each listed organ is indeed part of the urinary system.

Concept / Approach:
The urinary system mainly consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter blood to form urine. The ureters transport urine from the kidneys to the urinary bladder. The urinary bladder temporarily stores urine until it is convenient to release it. The urethra carries urine from the bladder to the outside. To answer the question, we must check if kidneys, ureters, and urinary bladder are all genuine urinary system organs. If they are, then the correct option should be the one that includes all three together.

Step-by-Step Solution:
Step 1: Recall that the kidneys are the primary organs of the urinary system, responsible for filtration of blood and formation of urine. Step 2: Remember that from each kidney, a muscular tube called the ureter emerges and carries urine down to the urinary bladder. Step 3: Understand that the urinary bladder is a hollow muscular organ that stores urine until micturition (urination). Step 4: Recognise that although the urethra is important, the options given are limited to kidneys, ureters, and bladder. Step 5: Check each option: options A, B, and C list individual structures, each of which belongs to the urinary system. Step 6: Option D states that all of the above are organs of the urinary system, which is consistent with standard anatomy. Step 7: Option E incorrectly suggests that ureters are not part of the urinary system, which contradicts their role in carrying urine.

Verification / Alternative check:
Anatomy diagrams of the urinary system always show a pair of kidneys at the back of the abdominal cavity, each connected to a ureter leading to the urinary bladder in the pelvis. Text descriptions list kidneys, ureters, bladder, and urethra as the components of the human urinary tract. None of these references exclude ureters or bladder from the urinary system. This confirms that kidneys, ureters, and urinary bladder are all legitimate urinary organs and that the option combining them is correct.

Why Other Options Are Wrong:

Kidneys: This option names only one organ, not the complete group mentioned in the stem.

Urinary bladder: Again, a single organ without the rest of the system.

Ureters: Also a single component, not the whole set.

Only kidneys and urinary bladder, but not ureters: Incorrect because ureters are clearly part of the urinary system.

Common Pitfalls:
Some learners may forget about the ureters because they are less visible and often not mentioned in casual discussions. Others may confuse the urinary system with the reproductive system in the pelvic region. A simple way to remember is that urine flows from kidneys to ureters, then to bladder, and finally out through the urethra. Any tube or organ that directly handles urine along this pathway belongs to the urinary system.

Final Answer:
The correct choice is that all of the listed organs (kidneys, ureters, and urinary bladder) are part of the urinary system.