 |
|
||||||||||||||
| |||||||
2-volume History Of England: Goldsmith's historical writings include the 2-volume History of England in a Series of Letters from a Nobleman to His Son (1764), the 4-volume History of England (1771), a 2-volume history of Rome (1769), and a 2-volume work on Greece (1774). None of these were products of original research; Goldsmith merely read through the authoritative histories in print and digested them in his own more readable style.Frequently revised and brought up to date, they remained standard texts in English and American schools for nearly a century, as did his 8-volume History of Earth and Animated Nature (1774), a survey of natural history drawn from many sources, but enlivened and enriched by his own observations.
The Stroke Volume. Each of the four chambers of an average-sized human heart holds about 2.5 ounces (80 cc) of blood; this is about the volume of blood pumped through and out of the heart with each heartbeat. This volume is called the stroke volume, and multiplying it by the heart rate, the minute volume is obtained. For example, if the heart rate is 60 beats a minute, the minute volume would equal 5 quarts (nearly 5 liters). During exercise, this figure can be greatly increased, even quadrupled, by two mechanisms, a doubling of the stroke volume and a doubling of the heart rate. Thus, it is possible, for at least short intervals, for the minute volume to increase from 5 quarts to 20 quarts (nearly 19 liters) of blood. |
|||||||
| Home | About Us | Contact Us | Site Map | Links | Library |
All Rights Reserved
