Respiration for Speech and Rest Breathing

Pleural Linings

Allows thoracic cavity expansion during inhalation. Airtight seal, continuous sheet, helps create surface tension like water under a drinking glass.

Visceral Pleura

covers the lungs (deep to parietal)

Parietal Pleura

lines the thoracic cavity (superficial to visceral)

Rest or quiet breathing

Breathing to stay alive without speaking. 40% inhale 60% exhale

Inhalation/Exhalation during quiet breathing

Inhalation is ACTIVE - major muscle contract

Exhalation is PASSIVE - no major muscles contract

1 Cycle of quiet inhalation

1. Diaphragm and external intercostals contract

2. Thorax expands due to pleural linkage

3. Ab contents compressed

4. Muscles of inhalation cease to be active

1 Cycle of quiet exhalation

1. Upward force from abs against diaphragm (elasticity?)

2. Ribs and sternum are elevated and need to unwind (torque)

Posture

Supine (laying on back makes breathing hard. Gravityyyy

Respiration for speech production

10% inhalation, 90% exhalation

Inhaling during speech

Active + involves diaphragm and external intercostals. Shorter and deeper than rest breathing.

Exhaling during speech

Active. Muscle of inhalation are used to keep restoring forces of torque, elasticity, and gravity from collapsing the thoracic cavity. Muscles are used to control the flow of air so that it is slow, sustained, and long in duration.