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.

What part of the gas excgange is it?

Name the organ

List the steps of the scientific method

d

e

f

c

b

a

Ask a question

Draw conclusions

Form a hypothesis

Communicate results

Analyze results

Conduct experiment

what are some risk factors for lung disease?

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