Kidney removes waste products from our body. What are the waste products that are removed by the kidney?

The correct answer is option 'D': Urea, water, and salts.

Explanation:
The kidneys are a pair of bean-shaped organs located on either side of the spine, just below the rib cage. One of the main functions of the kidneys is to remove waste products from the bloodstream and eliminate them from the body through urine production. Let's explore in more detail the waste products that are removed by the kidneys.

1. Urea:
- Urea is a waste product that results from the breakdown of proteins in the body.
- When proteins are metabolized, they produce ammonia, which is toxic to the body. The liver converts ammonia into urea, which is less toxic and easier to eliminate.
- The kidneys filter urea from the blood and excrete it in the urine.

2. Water:
- The kidneys play a crucial role in maintaining the body's water balance.
- They regulate the amount of water excreted in the urine, helping to maintain proper hydration levels.
- The kidneys reabsorb water from the filtrate, returning it to the bloodstream if the body needs to conserve water.
- Conversely, if the body needs to eliminate excess water, the kidneys can increase urine production.

3. Salts:
- The kidneys also help regulate the levels of various salts or electrolytes in the body, such as sodium, potassium, and chloride.
- These electrolytes are necessary for various bodily functions, including maintaining proper fluid balance, nerve function, and muscle contractions.
- The kidneys filter excess salts from the blood and excrete them in the urine.

Overall Function:
The kidneys perform the vital task of filtering waste products, including urea, water, and salts, from the bloodstream. They help maintain the body's overall balance of fluids, electrolytes, and pH levels. The waste products are eliminated through urine production, which is then excreted from the body.