Systemic Circulation Review
Down
Across
5 systolic minus diastolic
7 made only of the tunic intera
9 outermost layer of the blood vessels
10 layer of vessel wall that is made of smooth muscle
11 average is 120/80
13 take blood away from the heart
15 used with a blood pressure out and stethoscope to determine a
person's blood pressure
16 carries oxygenated blood to the heart
18 aorta is this type of artery
1 walls of veins are
those of arteries
2 blood vessels that are associated with the
kidneys
3 organ that can alter blood pressure by
controlling blood volumes
4 pulse pressure divided by 3, then add diastolic
6 artery following the brachiocephalic on the way
to the hand
8 major artery in the neck
12 top number in a blood pressure reading
14 artery that branches into radial and una
arteries

a community that experiences major changes undergoes progress

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]