The volume of air left in the lungs after maximum expiration is called `"_____________"` while volume of air breathed out during a normal restful respiration is called `"_____________"`.

Answer

To solve the question, we need to identify two specific terms related to lung volumes in the context of breathing.

1. **Identify the first term:**
- The question asks for the volume of air left in the lungs after maximum expiration. This is a specific term used in respiratory physiology.
- After maximum expiration, the lungs do not completely empty; there is always some air left. This volume is known as **residual volume**.

2. **Identify the second term:**
- The second part of the question asks for the volume of air that is breathed out during a normal restful respiration.
- This volume refers to the air that is inhaled and exhaled during a typical breathing cycle, which is known as **tidal volume**.

Putting it all together, we can fill in the blanks:

- The volume of air left in the lungs after maximum expiration is called **"residual volume"** while the volume of air breathed out during a normal restful respiration is called **"tidal volume."**

### Final Answer:
The volume of air left in the lungs after maximum expiration is called **"residual volume"** while the volume of air breathed out during a normal restful respiration is called **"tidal volume."**