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Updated: May 22, 2025
But this unsegmented primary axial skeleton is soon replaced by the segmented secondary axial skeleton, which we know as the vertebral column. In the head-half of the embryo the skeletal plate remains a continuous, simple, undivided layer of tissue, and presently enlarges into a thin-walled capsule enclosing the brain, the primordial skull.
It is most probable that any thin-walled vegetable structure which secretes may also be capable of absorbing under favorable conditions. The myriads of exquisitely-constructed glands of the Chinese primrose are not likely to be functionless. Mr. Darwin ascertained by direct experiment that they promptly absorb carbonate of ammonia, both in watery solution and in vapor.
Privacy could not be maintained in a house built for a family of five made to do duty for twelve, with one bath-room, thin-walled bedrooms with connecting doors through which the light streamed when one wished to sleep, and words frequently came not intended for outsiders.
A natural result of this enlargement of the openings, which admitted access with the scraper to the interior peripheries of the thin-walled jars, was the rounding upward of their shoulders, making them taller in proportion to their diameters.
Of this water the largest part is contained in the white, which is almost pure albumen, each particle of albumen being enclosed in very thin-walled cells; it is the breaking of these cells and the admission of air that enables one to beat the white of egg to a stiff froth. The fat is accumulated in the yolk, often amounting to thirty per cent.
That must be fixed for him by circumstances when he confronted them. Women and children stood in the dooryards watching the fire that was cutting through the thin-walled buildings on that side of the square the hotel side as if they were strawboard boxes.
They consist of slender, thin-walled tubes, which resemble veins in structure, and, like the veins, have valves. They differ from veins, however, in being more uniform in size and in having thinner walls. Thoracic duct. 2. Right lymphatic duct. 3. Left subclavian vein. 4. Right subclavian vein. 5. Superior vena cava. 6. Lacteals. 7. Lymphatic glands.
This profound truth was proving itself equal to the occasion at Warpington Vicarage. Mrs. Gresley was well again, after a fortnight at the seaside with Regie. The sea air had blown back a faint color into Regie's cheeks. The new baby's vaccination was ceasing to cast a vocal gloom over the thin-walled house.
The essential parts of a gland consist of a basement membrane, on one side of which are found actively growing cells, on the other is the blood current, flowing in exceedingly thin-walled vessels known as the capillaries. The cells are able to select from the blood whatever material they require and which they elaborate into the particular secretion.
In the lobule the air tube divides into a number of smaller tubes, each ending in a thin-walled sac, called an infundibulum. The interior of the infundibulum is separated into many small spaces, known as the alveoli, or air cells. The lungs are remarkable for their lightness and delicacy of structure.
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