| List-I (Cell/Tissue/Organs) | List-II (System) |
|---|---|
| 1. Mesorchium | 1. Reproductive system |
| 2. Uriniferous tubules | 2. Excretory system |
| 3. Endocrine glands | 3. Chemical coordination |
| 4. Sinus venosus | 4. Vascular system |
Mesorchium supports the testes within the male reproductive system. Uriniferous tubules, found in the kidney, are components of the excretory system responsible for filtration. Endocrine glands contribute to chemical coordination by releasing hormones that regulate bodily functions. The Sinus venosus, a component of the vascular system, functions in the heart to collect deoxygenated blood.