Problem 159 - Objective Biology for NEET

Question

Assertion: Jaundice is the yellowish discolouration of eye and skin. Reason: It occurs due to the deposition of bile pigments.

Step-by-Step Solution

Answer

The assertion and reason are both factually true, and the reason is a correct explanation of the assertion. Overproduction of bile pigments such as bilirubin, or a failure of the liver to effectively dispose of them, can lead to their deposition in body tissues, which manifests as the yellowing of eyes and skin, a symptom of jaundice.

Step 1: Understanding the terms

Jaundice refers to a medical condition characterized by yellowing of eyes and skin. Bile pigments, key component in the digestive system, are waste products the liver creates when it breaks down red blood cells. Large amounts of these pigments, primarily bilirubin, can result in yellow discoloration of the skin and eyes - a defining symptom of Jaundice.

Step 2: Linking Assertion and Reason

The assertion is a factual description of Jaundice - a yellowish discoloration of the eye and skin. The reason is also factual - indicating that the yellowing occurs because of the deposition of bile pigments. The interrelation lies in the fact that excess bile pigments in the bloodstream deposit in tissues, leading to yellow discoloration - which aligns with the symptoms of Jaundice.

Key Concepts

Bilirubin

Bilirubin is a yellow compound that plays a significant role in the occurrence of jaundice. It is primarily formed from the breakdown of hemoglobin in red blood cells. When red blood cells reach the end of their lifespan, the liver processes them in a series of steps that result in bilirubin production. Processed bilirubin is then ideally excreted from the body via bile, into the digestive system.

Problems arise when bilirubin builds up in the bloodstream, a condition which can happen if the liver is not functioning properly, or if the bile ducts are obstructed. This buildup leads to jaundice, which visibly manifests as yellowing of the skin and eyes. Therefore, monitoring bilirubin levels is crucial in diagnosing and managing liver health.

Bilirubin tests typically involve blood tests. These tests help in determining whether further medical investigation and intervention are necessary. Hence, understanding bilirubin's role in the body helps in recognizing the signs and underlying causes of jaundice.

Bile Pigments

Bile pigments are compounds derived from the breakdown of the heme protein in hemoglobin. The two main bile pigments are bilirubin and biliverdin. The liver converts biliverdin into bilirubin, which is then secreted into bile.

• Bilirubin: Yellow-orange pigment; predominantly contributes to jaundice symptoms.
• Biliverdin: Green pigment; converted by the liver into bilirubin.

Bile pigments play critical roles in digestion as they are part of the bile that helps emulsify fats, making them easier to digest. The liver produces bile, which is stored in the gallbladder and then released into the intestines during meals.

If these pigments accumulate in the body due to impaired liver function or blockages in the bile ducts, they lead to the visible symptoms of jaundice. Apart from their impact on the color of skin and eyes in jaundice, bile pigments also contribute to the brown color of stools. Changes in stool color can often indicate problems with bile flow.

Digestive System

The digestive system is responsible for breaking down food so that nutrients can be absorbed into the body. It involves several organs, including the liver, gallbladder, and intestines, all of which play a role in managing bile pigments such as bilirubin.

When you eat, food travels through the digestive tract, passing through organs that release enzymes and juices that help breakdown that food. The liver is crucial in this process as it produces bile, which aids in the digestion of fats. The bile, which contains bile pigments, is stored in the gallbladder until needed in the small intestine.

Jaundice occurs when there is a disruption in the normal flow of bile. This might be due to liver damage, an obstruction in the bile ducts, or an overproduction of bilirubin. Understanding the normal functioning of the digestive system is vital for recognizing where and how complications, such as jaundice, can arise.

By studying the digestive system, medical professionals can better diagnose and treat conditions related to bile pigment imbalances, ensuring that the organs involved in digestion function properly.