Inspiration/ Expiration/ Suitabliity of Lungs for Function

Question 0

explain the 3-5 steps of exhalation

Answer 0

1- diaphragm relaxes (pulling up)
2- intercostal muscles relax (pulling ribs down)
3- therefore- thoracic cavity volume decrease
lung volume decreases therefore increases air pressure inside cavity
air rushes out to equalize pressure

Question 1

Explain the 3- 5 steps of inhalation

Answer 1

1- diaphragm contracts (pulling down)
2- intercostal muscles contract (pulling ribs up)
3- therefore- thoracic cavity volume increases
lung volume increases therefore lowers air pressure inside cavity
air rushes in to equalize pressure

Question 2

Name the 6 reasons for suitbalility

Answer 2

• 3 million alveioli- SA
• Alveioli cell thick- quick gas exchange
• capillaries next to alveoli- efficeint
• covered in water- gas diffuses through water then membrane
• elasticity- expansion and relaxion
• sealed thoracic cavity- enables differences in pressure

Question 3

What has the body done to reduce the chance of the lungs loosing moisture

Answer 3

Enclosed chest cavity

Opening small, reduce loss

Question 4

What would happen to lungs if it’s too hot outside?

Answer 4

Would become too dry, difficult to diffuse through membrane= hard to breathe