A text-book of physiology, for medical students and physicians . de-termine how much blood flowsout in a given time. We maydefine the velocity of the bloodat any point as the length ofthe column of blood flowing bythat point in a second. If wecut the artery there a cylindri-cal column of blood of a defi-nite length and with a cross-areaequal to that of the lumen ofthe artery will flow out in asecond. The volume of theoutflow can be determined di-rectly by catching the blood. Knowing this volume and the ™ Kg. —Ludwigs stromuhr: a and b, . I he glass bulbs; a is filled with oil to the CrOSS
A text-book of physiology, for medical students and physicians . de-termine how much blood flowsout in a given time. We maydefine the velocity of the bloodat any point as the length ofthe column of blood flowing bythat point in a second. If wecut the artery there a cylindri-cal column of blood of a defi-nite length and with a cross-areaequal to that of the lumen ofthe artery will flow out in asecond. The volume of theoutflow can be determined di-rectly by catching the blood. Knowing this volume and the ™ Kg. —Ludwigs stromuhr: a and b, . I he glass bulbs; a is filled with oil to the CrOSS-area Of the artery, we Can mark (5 ), while b and the neck are filledi , • ,i t .-1 » ,, with salt solution or defibrinated blood: p, determine the length Of the the movable plate by means of which the bulbs may be turned through 180 degrees,c, c, for the cannulas inserted into the artery;s. the thumb screw for turning the bulbs;h, the holder. When in place the clampson the arteries are removed, blood flowsthrough c into a, driving out the oil and. column—that is, the velocityof the flow—since in a cylinderthe volume, V, is equal to the product Of the length into the forcing the salt solution m b into the head end oi the artery through c . When the cross-area. V = length X cross-area, orV length = cross-area blood entering a reaches the mark, the bulbf are turned through 180 degrees so that b lies over c. The blood flows into b and drives the oil back into a. When it just fills this bulb, they are again rotated through 180 degrees, and so on. The oil is driven out of and into a a given number of times, each movement being equal to an outflow of 5 of blood. When the instrument has been We Cannot, Of COUrse, make turned, say, , 50 of blood have 1 . .. ... flowed out. Knowing the time and the the experiment in thlS Simple caliber of the artery, the calculation is made v • , ., as described in the text. Several modify Way Upon a living animal; th
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