Ventilation

Question 1

what are the external intercostal muscles

Answer 1

they surround the rib cage

Question 2

what happens to the external intercostal mscls when we inspire

Answer 2

they contract and move downwards

Question 3

what happens to the ribcage, thoracic cavity, and diaphragm when we inspire

Answer 3

the external intercostal muscles move them up and outards
the diaphragm moves downwards
the thoracic cavity volume increases

Question 4

what happens to the pressure in the lungs when we breate in

Answer 4

due to the increased volume of the thoracic cavity, the pressure in the lungs decrease causing a pressure gradient between the outside of the lungs and the inside

Question 5

describe air flow wen we breathe in

Answer 5

air flows down pressure gradient
air then flows down the trachea to the alveoli

Question 6

what hapens to the muscles diaphragm and rib cage during expiration

Answer 6

the external intercostal muscles relax
the internal intercostal muscles cointract

the rib cage moves downwards and inwards
the diaphragm relaxes and moves upwards

Question 7

what happens to the thoracic cavity when we exhale

Answer 7

the volume of thoracic cavity decreases

Question 8

what happens to the pressure in the lungs when exhales

Answer 8

the decreased volume in the thoracic cavity causes the pressure in the lungs to increase

Question 9

describe air flow when we exhale

Answer 9

air flows out of the lungs down the pressure gradient
air flows out of the alveoli and up the trachea