Given below is an example of certain structures and their special functional activities. For example: Eye and vision. On a similar pattern, complete the following:
(i) Neutrophils:
(ii) Ureter:
(iii) Neurotransmitters:
(iv) Iris of the eye:
(v) Placenta:

Explanation

To solve the question, we need to identify the specific functions of the given structures. Let's go through each one step by step.

### Step 1: Neutrophils
- **Identification**: Neutrophils are a type of white blood cell.
- **Function**: Their primary function is **phagocytosis**, which is the process of engulfing and digesting foreign particles, such as bacteria, at the site of infection or inflammation.

### Step 2: Ureter
- **Identification**: Ureters are tubes that connect the kidneys to the bladder.
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