In distal regions its diameter would be one-fourth to one-fifth that of the pulmonary artery.

An arteriole () is a small diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries.

However there was a significant increase in resting brachial artery diameter.

Atheroma and changes in the artery wall usually result in small aneurysms ( enlargements ) just large enough to compensate for the extra wall thickness with no change in the lumen diameter.

To visualize an artery or vein, angiographic techniques are used and the physician positions the tip of a guidewire, usually 0. 36 mm ( 0. 014 ") diameter with a very soft and pliable tip and about 200 cm long.

Now a length of artificial tubing, 3 to 4 millimeters in diameter, is sewn between either the subclavian or the carotid artery and the corresponding side branch of the pulmonary artery, thus obviating the need to cut off blood supply and making it easier to regulate the blood flow to the lungs.

A small catheter ( 1 mm in diameter ) is inserted into the femoral artery at the level of the groin under local anesthesia.

The central retinal artery is approximately 160 micrometres in diameter.

This original capsule contained a battery and a transistor oscillator and was about 1 cm. in diameter.

In the observations at 4.3 mm ( Coates, 1959 ), the diameter of the antenna beam, 6'.7, was small enough to allow resolution of some of the larger features of the lunar surface, and contour diagrams have been made of the lunar brightness distribution at three lunar phases.

The half-intensity diameter of the antenna beam was about 9', and the angle subtended by the moon included the entire main beam and part of the first side lobes.

The half-intensity diameter of the main lobe of the antenna was about 18'.5, and the brightness temperature was reduced by assuming a Gaussian shape for the antenna beam and a uniformly bright disk for the moon.

This, however, can only be considered approximate, as the diameter of the pulley was increased by the build-up of tape and the tape was occasionally removed from the pulley during the runs.

It was observed that EWC macromolecules are the same diameter ( 15 a. ) but much longer ( up to several microns ) than vertebrate tropocollagen.

Apus was one of twelve constellations created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman and it first appeared on a 35 cm diameter celestial globe published in 1597 ( or 1598 ) in Amsterdam by Plancius with Jodocus Hondius.

The mission's specific landing site was located between two young impact craters, North and South Ray craters — and in diameter, respectively — which provided " natural drill holes " which penetrated through the lunar regolith at the site, thus leaving exposed bedrock that could be sampled by the crew.

" Fifty stadia 6 mi from the coast was a mountain that was low on all sides ... broke it off all round about ... the central island itself was five stades in diameter 0. 92 km ; 0. 57 mi.

The angular diameter of Altair was measured interferometrically by R. Hanbury Brown and his co-workers at Narrabri Observatory in the 1960s.

It was 4. 3 meters ( 14 ft ) in diameter and constructed of aluminum aircraft tubing and a vinyl-plastic skin, in the form of an icosahedron.

He found that material was scattered over an area in diameter, and in addition to military and nautical equipment recovered a large number of gold and silver coins from countries across the Mediterranean, some from the seventeenth century.

In 1846 Robert Smirke was replaced as the Museum's architect by his brother Sydney Smirke, whose major addition was the Round Reading Room 1854 – 1857 ; at in diameter it was then the second widest dome in the world, the Pantheon in Rome being slightly wider.

The large girth of Blue Steel was determined by the implosion sphere diameter of Green Bamboo.

A seven-person project group was formed to develop an optical audio disc with a diameter of 20 cm with a sound quality superior to that of the large and vulnerable vinyl record.

Rather than the original 20 cm size, the diameter of this compact disc was set at 11. 5 cm, the diagonal measurement of a compact cassette.

These thin pieces were then pulled through a draw plate repeatedly until the desired diameter was achieved.

The comet was later observed as a series of fragments ranging up to in diameter.

A full-phase diffuse sphere reflects ⅔ as much light as a diffuse disc of the same diameter.

With CVD diamond growth areas of greater than fifteen centimeters ( six inches ) diameter have been achieved and much larger areas are likely to be successfully coated with diamond in the future.

Their territorial ranges can be as much as 19 km in diameter around the den, and travel occurs along fixed trails.

The golf discs used today are much smaller and heavier than traditional flying discs, typically about 8 or 9 inches ( 20 or 23 cm ) in diameter and weighing between 129 and 180 grams.

Timbales are tuned much higher than a tom of the same diameter, and normally played with very light sticks.

* The Peruvian meteorite event – On 15 September 2007, a stony meteorite that may have weighed as much as 4000 kilograms created a crater 13 meters in diameter near the village of Carancas, Peru.

Hard shmura matzah is often a round hand-made matzah about a foot in diameter ; machine-made hard matzah is usually square and much smaller.

The soma is usually about 10 – 25 micrometers in diameter and often is not much larger than the cell nucleus it contains.

As a result a completely new design much larger in diameter but with much smaller increased air resistance was born, these new designed parasails can now be seen all over the world transforming the sport of parasailing.

Given its dimensions ( 10, 000 kilometers in diameter ) it is more like Banks ' Culture Orbitals ( though much smaller ) than Niven's behemoth.

The postholes are smaller than the Aubrey Holes, being only around in diameter, and are much less regularly spaced.

For example, notable types of baozi from Shanghai such as xiaolongbao () and the shengjian mantou () are usually about four centimetres in diameter, much smaller than the typical baozi or mantou elsewhere.

Directly behind the rim is the cup, which channels the air into a much smaller opening ( the back bore or shank ) that tapers out slightly to match the diameter of the trumpet's lead pipe.

However, because the average speed of a blade affects pumping so much this is done by increasing the root diameter rather than the tip diameter where practical.

Near Keany Square, at 529 Commercial Street, a huge molasses tank 50 ft ( 15 m ) tall, 90 ft ( 27 m ) in diameter and containing as much as collapsed.

The dust in meteoroid streams is much larger, 300 to 10, 000 micrometres in diameter, and falls apart in smaller zodiacal dust grains over time.

* September 18 – Great Comet of 1882: Her Majesty's Astronomer at the Cape, David Gill, reported watching the comet rise a few minutes before the Sun and described it as " The nucleus was then undoubtedly single, and certainly rather under than over 4 ″ in diameter ; in fact, as I have described it, it resembled very much a star of the 1st magnitude seen by daylight.

However, because ureteroscopy of the upper ureter is much more challenging than ESWL, many urologists still prefer to use ESWL as a first-line treatment for stones of less than 10 mm, and ureteroscopy for those greater than 10 mm in diameter.

This means that if the inflation theory is correct, the 93 billion light year diameter of the observable universe is approximately as much smaller than the diameter of the entire universe as the diameter of a helium atom is compared to the diameter of the Sun.