B.7A

Describe the structure of the trachea and its function in the mammalian gaseous exchange system.

• Wide tube supported by C-shaped cartilage to keep the air passage open during pressure changes.

• Do not need to be kept open by cartilage, therefore mostly have only muscle and elastic fibres so that they can contract and relax easily during ventilation.

• Mini air sacs, lined with epithelium cells, site of gas exchange.

• External intercostal muscles relax (while internal contract), bringing the ribs down and in.

Tags

NGSS.MS-LS1-3

Name and describe three adaptations of a leaf that allow efficient gas exchange.

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What part of the gas excgange is it?

Name the organ

List the steps of the scientific method

d

e

f

c

b

a

Communicate results

Conduct experiment

Analyze results

Form a hypothesis

Draw conclusions

Ask a question

what are some risk factors for lung disease?

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Point the ARTERIES

Describe the pathway taken by air as it enters the mammalian gaseous exchange system.

NASAL CAVITY-TRACHEA-BRONCHI-________-ALVEOLIS

What are these?

• Gills

• Fins

• Tail

• Scales

Tags

NGSS.MS-LS4-2

Point on LEAF STOMATA

Tags

NGSS.MS-LS1-6