respiration Flashcards

1
Q

LUNGS:

List the adaptations of the alveoli that make it ideal for gas exchange

A
Single layer of epithelium cells
Stretch as breathe in
Spring back as breathe out
Huge SA
Moist
Rich blood supply
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2
Q

LUNGS:

What prevents the trachea from collapsing?

A

Rings of cartilage

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3
Q

LUNGS:

What happens to the intercostals as we breathe in

A

External contract

Internal relax

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4
Q

LUNGS:

What happens to the rib cage and the diaphragm before we inhale

A

Ribs - move up and out

Diaphragm - contracts and moves down

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5
Q

LUNGS:

What happens to the volume and pressure of the thorax before we inhale air

A

Volume increases

Pressure decreases

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6
Q

LUNGS:

What is the ‘tidal volume’?

A

The volume of air we breath in and out at rest (typically about 0.5dm3)

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7
Q

LUNGS:
List the events of

a) Intercostal Muscles
b) ribs
c) Diaphragm
When we exhale

A

a) Internal contract, external relax
b) Ribs move down and in

c) Diaphragm relaxes, domes up

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8
Q

Describe how we breathe IN

A

Diaphragm contracts
External intercostal muscles contract

Volume increases and pressure decreases in thorax
Air moves into lungs

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9
Q

Describe how we breathe OUT

A

Diaphragm relaxes
Internal intercostal muscles contract

Volume decreases and pressure increases in thorax
Air moves out of the lungs

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10
Q

describe the pathway of an oxygen molecule from alveolus to blood

A

crosses the single cell alveolar epithelium and then epithelium of the capillary

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11
Q

describe ONE feature of the alveolus that allows efficient gas exchange

A

ONE CELL thick therefore creating a SHORTER diffusion pathway

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