During inhalation, the pressure in the thoracic cavity: (2022)
Practice Questions
1 question
Q1
During inhalation, the pressure in the thoracic cavity: (2022)
Increases
Decreases
Remains constant
Fluctuates
During inhalation, the diaphragm contracts, increasing the volume of the thoracic cavity and decreasing the pressure, allowing air to flow in.
Questions & Step-by-step Solutions
1 item
Q
Q: During inhalation, the pressure in the thoracic cavity: (2022)
Solution: During inhalation, the diaphragm contracts, increasing the volume of the thoracic cavity and decreasing the pressure, allowing air to flow in.
Steps: 4
Step 1: The diaphragm, a muscle under your lungs, moves downwards.
Step 2: When the diaphragm moves down, it makes more space in the thoracic cavity (the area where your lungs are).
Step 3: As the space increases, the pressure inside the thoracic cavity decreases.
Step 4: Because the pressure is lower inside the thoracic cavity than outside, air from outside flows into the lungs.
