Ordinary quiet breathing is

Options

A. apena
B. eupnea
C. dyspnea
D. asphyxia

Answer

To solve the question "Ordinary quiet breathing is", we need to identify the correct term that describes this type of breathing from the given options.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes ordinary quiet breathing.

2. **Analyzing the Options**:
- **Option A: Apnea** - This refers to a temporary cessation of breathing.
- **Option B: Upnea** - This term is used to describe normal, quiet breathing that occurs at rest.
- **Option C: Dyspnea** - This refers to difficulty in breathing or shortness of breath.
- **Option D: Asphyxia** - This is a condition arising from a lack of oxygen, leading to suffocation.

3. **Identifying the Correct Answer**:
- From the analysis, "upnea" is the term that specifically refers to ordinary quiet breathing. It is characterized by the diaphragm and external intercostal muscles contracting without the need for conscious thought.

4. **Conclusion**: The correct answer is **Option B: Upnea**.

### Final Answer:
Ordinary quiet breathing is called **upnea**.