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Inspiration can occur if the intra-pulmo...

Inspiration can occur if the intra-pulmonary pressure is ________A________ than the atmospheric pressure. Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber in the ________B_______ axis.

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B

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The correct Answer is:
To solve the question, we need to fill in the blanks regarding the process of inspiration in the respiratory system. ### Step-by-Step Solution: 1. **Understanding Inspiration**: - Inspiration is the process of taking air into the lungs. It occurs when there is a pressure difference between the atmospheric pressure and the pressure inside the lungs (intrapulmonary pressure). 2. **Intrapulmonary Pressure**: - For inspiration to occur, the intrapulmonary pressure must be lower than the atmospheric pressure. This creates a pressure gradient that allows air to flow into the lungs. - Therefore, we fill in the first blank (A) with the word "less". 3. **Diaphragm Contraction**: - The diaphragm is a dome-shaped muscle that plays a crucial role in breathing. When it contracts, it moves downward, increasing the volume of the thoracic cavity. 4. **Volume Increase in the Thoracic Chamber**: - The increase in volume of the thoracic chamber occurs primarily in the anteroposterior axis. This axis runs from the front (anterior) to the back (posterior) of the body. - Thus, we fill in the second blank (B) with "anteroposterior". ### Final Answer: - A: less - B: anteroposterior
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