Problem 116 - Objective Biology for NEET

Question

On an average _________ of urea is excreted out per da (a) \(20-25 \mathrm{gm}\) (b) \(25-30 \mathrm{gm}\) (c) \(25-30 \mathrm{mg}\) (d) \(40-45 \mathrm{gm}\)

Step-by-Step Solution

Answer

The correct answer is (b) 25-30 grams.

Step 1: Understand the options

It's crucial to comprehend what each option given in the exercise implies: (a) represents 20-25 grams of urea, (b) means 25-30 grams, (c) indicates 25-30 milligrams (which is a much smaller quantity), and (d) signifies 40-45 grams of urea.

Step 2: Consider the biology involved

Understanding human biology is key in this exercise. Through biological studies, it has been found that, on average, a human excretes 25-30 grams of urea per day.

Step 3: Choose the correct answer

Based on the information given in Step 2, the correct answer to this problem is (b): '25-30 grams'. This is the option that aligns with the known biological fact expressed in Step 2.

Key Concepts

Human Physiology

The human body is an intricate system, constantly processing, recycling, and eliminating substances to maintain balance. One crucial aspect of human physiology is how our bodies deal with waste products. Proteins in our diet are broken down into amino acids, which are further metabolized into ammonia, a toxic compound. Our bodies convert this ammonia into urea, a less harmful compound, for safe elimination.
Human physiology ensures that urea, along with other waste products, is effectively removed from the body to maintain homeostasis. Urea is primarily formed in the liver through the urea cycle, and its excretion is vital to prevent the buildup of toxins. On average, humans excrete between 25 to 30 grams of urea daily. This process is essential for our overall health and emphasizes the critical role of physiology in managing waste and toxins.

Excretory System

The excretory system is a network of organs and processes that manage the removal of waste from the body. It involves several key organs, including the kidneys, ureters, bladder, and urethra. The main function of the excretory system is to filter and purify the blood by removing waste products and excess substances.
The kidneys are the primary organs responsible for urea excretion. They filter the blood, removing not just urea but also other metabolic waste, through a million tiny units called nephrons. As blood passes through the nephrons, waste products including urea, along with water and salts, are filtered to form urine.

• Ureters carry urine from the kidneys to the bladder, where it is temporarily stored.
• The bladder serves as a holding area for urine before it is expelled through the urethra during urination.

The excretory system ensures waste material does not build up in the body, maintaining healthy blood and internal environment.

Biomedical Studies

Biomedical studies are critical in understanding the various processes involved in the excretion of urea and other waste products. Research in this field provides insights into how diseases can impact these processes and lead to imbalances.
Scientists in biomedical studies continuously explore how different factors affect the excretory system. They investigate issues such as kidney diseases, which can significantly alter the body's ability to excrete urea. Understanding these conditions helps inform treatment and management strategies.

• Research in excretion mechanisms contributes to advancements in treatments for kidney failure, such as dialysis and transplants.
• These studies also explore the impacts of dietary changes, medications, and lifestyle on urea production and excretion.

Overall, biomedical studies enhance our understanding of how the body functions were performed during normal and diseased states, ultimately leading to better healthcare outcomes.