Tissue fluid is ultimately returned to the

Options

A. Excretory system
B. Cardiovascular system
C. Respiratory system
D. Digestive system

Answer

**Step-by-Step Solution:**

1. **Understanding Tissue Fluid**: Tissue fluid, also known as interstitial fluid, is the fluid that surrounds the cells in tissues. It is derived from blood plasma and plays a crucial role in the exchange of nutrients and waste between blood and cells.

2. **Role of Lymphatic System**: The lymphatic system is responsible for collecting excess tissue fluid and returning it to the bloodstream. It consists of lymphatic vessels, lymph nodes, and lymph.

3. **Return to Bloodstream**: The collected tissue fluid, now referred to as lymph, is transported through the lymphatic vessels. Eventually, it is returned to the bloodstream via the thoracic duct or the right lymphatic duct, which empty into the subclavian veins.

4. **Final Destination**: Thus, the ultimate destination of tissue fluid is the bloodstream, where it re-enters circulation and helps maintain fluid balance in the body.

**Final Answer**: Tissue fluid is ultimately returned to the bloodstream.

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