6.6 structure of the human exchange system Flashcards

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1
Q

why is the mammalian lungs located inside the body?

A

air is not dense enough to support & protect the structure, and therefore the body will lose a great amount of water & dry out

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2
Q

how is the trachea supported?

A

by rings of cartilage to prevent collapsing

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3
Q

describe the 3 features of the bronchi.

A
  • supported by cartilage rings
  • each leads to 1 lung
  • produces mucus to trap particles & cilia moves it towards the throat
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4
Q

what are bronchioles & what are some special features of it to control air flow?

A
  • branching subdivisions of bronchi
  • muscle wall lined with epithelial cells & allows constriction
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5
Q

describe the 3 structural features of the alveoli.

A
  • air sacs lined with epithelium cells
  • collagen & elastic fibres in between allows alveoli to stretch
  • alveolar membrane is the site of gas exchange surface
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