The Pregnant Body Book by Sarah Brewer

Author:Sarah Brewer [Brewer, Sarah]
Language: eng
Format: epub, mobi
Amazon: B009CUTYTC
Publisher: DK Publishing
Published: 2011-05-30T04:00:00+00:00

CONCEPTION T

Bronchioles

These tiny terminals of

the bronchi are made

up of smooth muscle.

Bronchi

O BIR

These main branches

consist of a framework

of cartilage, joined by

smooth muscle and

TH

fibrous tissue.

Right main

bronchus

This is larger

and angled

more steeply

than the left

main bronchus.

LUNGS AT 36 WEEKS

Alveolar type II cell

These cells start releasing

surfactant at 36 weeks,

LUNGS AT 28 WEEKS

preventing the air sacs

from collapsing when

Left lung

they are used after birth.

This contains only

Further division

two lobes, or

At this stage, the respiratory

regions, to make

bronchioles are dividing to

room for the heart;

form terminal sacs.

the right lung has

three lobes.

Elastin fiber

These fibers allow

lung tissue to expand

and contract with

each breath, after the

baby is born.

Connective

tissue cell

Many more

of these have

developed; they

Alveolar type I cell

are now densely

These cells become

Capillary

packed.

progressively thinner,

and form part of the

blood–air barrier.

36 WEEKS

28 WEEKS

Capillary

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