PRC Breathing Mechanics & Diaphragm Function

Question 1

What is the primary muscle responsible for inspiration during quiet breathing?

Accepted Answer

Diaphragm

Answer

Intercostal muscles

Answer

Rectus abdominis

Answer

Latissimus dorsi

Question 2

Which structure passes through the diaphragm and allows air flow from the throat to the lungs?

Accepted Answer

Esophagus

Answer

Trachea

Answer

Larynx

Answer

Bronchi

Question 3

What happens to intrathoracic pressure during diaphragm contraction?

Accepted Answer

It decreases

Answer

It increases

Answer

It remains constant

Answer

It fluctuates randomly

Question 4

What is a key sign of dysfunctional breathing mechanics?

Accepted Answer

Use of accessory muscles

Answer

Relaxed belly movement

Answer

Diaphragmatic descent

Answer

Slow respiratory rate

Question 5

Which nerve innervates the diaphragm?

Accepted Answer

Phrenic nerve

Answer

Vagus nerve

Answer

Accessory nerve

Answer

Intercostal nerve

Question 6

How does proper diaphragm function affect posture?

Accepted Answer

Improves spinal alignment

Answer

Causes spinal curvature

Answer

Decreases core strength

Answer

Reduces lung capacity

Question 7

Which technique can be used to assess diaphragm function?

Accepted Answer

Ultrasound imaging

Answer

Electrocardiography

Answer

Spirometry

Answer

Pulse oximetry

Question 8

What type of breathing pattern promotes parasympathetic nervous system activation?

Accepted Answer

Diaphragmatic breathing

Answer

Shallow chest breathing

Answer

Rapid breathing

Answer

Apnea

Question 9

Why is diaphragmatic breathing emphasized in rehabilitation?

Accepted Answer

It promotes efficient respiration and core stability

Answer

It increases respiratory rate

Answer

It decreases lung volume

Answer

It weakens the abdominal muscles