Problem 3 - Campbell Biology

Question

Which of the following organs is incorrectly paired with its function? (A) stomach-protein digestion (B) large intestine-bile production (C) small intestine-nutrient absorption (D) pancreas-enzyme production

Step-by-Step Solution

Answer

Option (B) large intestine-bile production is incorrectly paired.

Step 1: Identify the given pairs

Carefully read each option to identify the organ and its corresponding function.(A) stomach-protein digestion(B) large intestine-bile production(C) small intestine-nutrient absorption(D) pancreas-enzyme production

Step 2: Recall the functions of each organ

Recall the primary functions of each organ listed:- The stomach primarily functions in the digestion of proteins.- The large intestine primarily functions in water absorption and waste formation, not bile production.- The small intestine is primarily responsible for nutrient absorption.- The pancreas produces digestive enzymes and insulin.

Step 3: Identify the incorrect pair

Compare each organ's function with its listed function in the options. The large intestine does not produce bile; bile production is a function of the liver.

Key Concepts

organ functions

Understanding the functions of different organs is crucial for grasping how our digestive system operates. The stomach, for example, is responsible for breaking down proteins, primarily using acid and digestive enzymes like pepsin. The large intestine, however, has a different role: it absorbs water and salts from the material that has not been digested as food, and is also involved in forming and expelling waste. On the other hand, bile production is actually the function of the liver, not the large intestine. Then, we have the small intestine, which serves a key role in nutrient absorption. The walls of the small intestine are lined with villi and microvilli, which increase its surface area and make nutrient absorption extremely efficient. Finally, the pancreas produces important digestive enzymes and also regulates blood sugar levels by producing insulin.

protein digestion

Protein digestion begins in the stomach, where proteins are broken down by gastric juices. These gastric juices contain hydrochloric acid and the enzyme pepsin. The acidic environment of the stomach helps denature proteins, unraveling their complex structures and making it easier for enzymes to break them down. The partially digested proteins then move to the small intestine, where they are further broken down by other enzymes like trypsin and chymotrypsin, produced by the pancreas. By the time protein reaches the end of the small intestine, it has been broken down into amino acids, which can then be absorbed into the bloodstream.

nutrient absorption

The small intestine is the powerhouse of nutrient absorption. Its interior surface is covered with tiny hair-like structures called villi, which extend to form microvilli. These structures vastly increase the surface area, allowing for maximum nutrient absorption. Once food particles are broken down into their simplest forms (like amino acids, monosaccharides, and fatty acids), they are absorbed through these villi into the bloodstream. The small intestine has specialized transport systems that move these nutrients from the intestines into the blood, ensuring that every part of the body gets essential nutrients for energy, cell repair, and growth.

enzyme production

Enzymes are vital for digesting food, and the pancreas plays a major role in producing them. Digestive enzymes produced by the pancreas include amylase (for carbohydrate digestion), lipase (for fat digestion), and proteases like trypsin and chymotrypsin (for protein digestion). These enzymes are secreted into the small intestine, where they assist in breaking down food particles into their smallest components. Without enzymes, our bodies wouldn't be able to break down food effectively, leading to poor nutrient absorption and digestion-related issues.