Chapter 34, Problem 31A

Summary Introduction

To write:

About the amount of urea that is absorbed by the kidney based on the given estimation

Introduction:

The excretory system is the system of an organism's body that performs the function of excretion, the bodily process of discharging wastes. Several parts of the body are involved in this process, such as sweat glands, the liver, the lungs and the kidney system. The kidneys maintain homeostasis by removing wastes and excess water from the body and by maintaining the pH of the blood. The kidneys are the major excretory organ in the body. It is a bean-shaped organ that is involved in urine formation performs filtration of blood.

Answer to Problem 31A

Correct answer:

The correct answer is option (B) 23.4g/day.

Explanation of Solution

Explanation/justification for the correct answer:

Option (B) 23.4g/day. Based on the estimate, kidney filters 46.8g/day of urea from which kidneys excrete 23.4g/day of urea. The kidneys reabsorb about 50 per cent of the urea. That means the kidneys absorb urea 23.4g/day. So, the correct answer is option (B).

Explanation for incorrect answer:

Option (A) 0.50g/min. Based on the estimate, 0.50g/min is not correct. 0.0325g/min is accurate. So, this is an incorrect option.

Option (C) 46.8g/day. Based on the estimate, 46.8g/day is the total amount of urea that is filtered by kidneys. So, this is an incorrect answer.

Option (D) 50.0g/day. Based on the estimate, 46.8g/day is the total amount of urea filtered by kidneys. Therefore, the 50.0g/day is not correct. So, this is an incorrect answer.