Breathing | In

: These muscular actions expand the thoracic cavity, increasing the volume of the lungs.

🫁 : The primary "product" of this phase is the delivery of fresh oxygen ( O2cap O sub 2 breathing in

"Breathing in," or , is the active phase of the respiratory cycle where air is drawn into the lungs. This process is driven by muscular contraction that creates a pressure gradient between the atmosphere and the chest cavity. Key Features of Inhalation : These muscular actions expand the thoracic cavity,

: Tiny air sacs where gas exchange occurs with capillaries. Structure and function of the gas exchange system - BBC breathing in

: The external intercostal muscles contract, pulling the rib cage upward and outward.