Science, Maths & Technology
Blood and the respiratory system
...centre in the medulla of the brain. The intercostal muscles are located in the ribcage. They receive neuronal inputs from intercostal nerves that arise from the thoracic nerves of the spinal cord. The bronchi and bronchioles are also surrounded by smooth muscle cells that contract and dilate to regulate the amount of air that passes down to the alveoli. Activity 2...