During which type of breathing are the muscles of exhalation inactive?

What is phonation threshold pressure?

What is a distinguishing feature of voiceless affricates on a spectrogram?

What is the relationship between the ribcage movement and lung volume during exhalation? 

Frequency of vibration refers to: 

How does the tongue position affect the first formant frequency? 

What characterizes the exhalation during speech breathing (SB) compared to breathing at rest (BAR)?

How do voiced alveolar fricatives appear on a spectrogram compared to voiceless alveolar fricatives? 

During which stage of vocal fold vibration is the airflow progressively decreasing? 

What initiates the opening of the vocal folds according to the Myoelastic Aerodynamic theory?