Question

Explain (400-500 words) the cycle of breathing, including the function of:
• Lungs • Diaphragm • Intercostal muscles
• Accessory muscles • Visceral pleura
• Parietal pleura • Pleural cavity

Answer 1

Explanation:

At the base of the brain, the carotid and vertebrobasilar arteries form a circle of communicating arteries known as the Circle of Willis. From this circle, other arteries—the anterior cerebral artery (ACA), the middle cerebral artery (MCA), the posterior cerebral artery (PCA)—arise and travel to all parts of the brain.