Which of the following kinds of nutrients does the lymphatic system carry to the bloodstream? a. Carbohydrates b. Water and water-soluble vitamins c. Proteins d. Large fats and fat-soluble vitamins

**Step 1: Understanding the Lymphatic System** The lymphatic system is responsible for returning interstitial fluid to the bloodstream and is also involved in the absorption of certain nutrients from the digestive tract. **Step 2: Nutrient Absorption in the Intestine** In the small intestine, nutrients such as carbohydrates, proteins, and water-soluble vitamins are absorbed directly into the blood capillaries. However, fats are absorbed differently. **Step 3: Absorption of Fats** Large fats and fat-soluble vitamins (i.e., vitamins A, D, E, and K) are too big to enter the blood capillaries directly. Instead, they are packaged into particles called chylomicrons. **Step 4: Role of the Lymphatic System** These chylomicrons are then transported via the lymphatic vessels (lacteals) rather than directly into the blood. Once they enter the lymphatic system, they are eventually dumped into the bloodstream through the thoracic duct. **Step 5: Evaluating the Choices** - \( \textbf{a. Carbohydrates} \): These are absorbed into the bloodstream directly. - \( \textbf{b. Water and water-soluble vitamins} \): These too are absorbed directly into the blood. - \( \textbf{c. Proteins} \): Their smaller units (amino acids) are absorbed directly into the blood. - \( \textbf{d. Large fats and fat-soluble vitamins} \): These are absorbed via the lymphatic system using chylomicrons. **Conclusion** The lymphatic system carries \( \textbf{large fats and fat-soluble vitamins} \) to the bloodstream. **Answer: d. Large fats and fat-soluble vitamins**