Now that we've talked about your blood vessels, we're going to zoom in a little closer and talk about your blood itself. We'll start by outlining the basic components of blood -- including erythrocytes, leukocytes, platelets, and plasma -- as well as the basic process of hemostasis that stops bleeding, and how antigens are responsible for the blood type that you have. By the end of this episode, you should be totally prepared for your next blood drive.
Table of Contents
The Basic Components of Blood 2:30
Erythrocytes, Leukocytes, Platelets, and Plasma 3:00
The Basic Process of Hemostasis 4:45
How Antigens Are Responsible For Your Blood Type 6:21
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Nitrogen makes up 78% of the air, however neither plants nor animals can take nitrogen directly from the air because nitrogen is so unreactive.
The nitrogen cycles shows the movement of nitrogen through the environment. Nitrogen is continually cycled through the air, soil and living things.
Plants take up nitrogen compounds as nitrates from the soil. Animals then eat these plants, thus getting their nitrogen.
The process of nitrogen in the atmosphere being turned into nitrogen in the soils is called fixing. There are different ways that nitrogen is 'fixed; including nitrogen fixing bacteria in the soil which turns nitrogen from the air into nitrates. Decomposers in the soils break down animal excretion and dead organisms, returning nitrogen back to the soil as ammonia. Lightning can cause chemical reactions in the atmosphere, resulting in nitrogen reacting with oxygen to produce nitrous oxide. Burning fossil fuels also adds nitrous oxide to the atmosphere, resulting in nitric acid, but this is of course not a natural way of nitrogen fixing. Blue-green algae in the ocean also can fix nitrogen. This then provides sources of nitrogen to aquatic animals, and the nitrogen goes around a similar cycle to what happens on land.
The Haber Process makes up approximately 30% of nitrogen fixing.
Denitrifying bacteria in the soil break down nitrates and return nitrogen back to the air. This reduces the fertility of the soil.
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You will learn about "Nitrogen Cycle" in this video. Nitrogen constitutes around 78% of the air. However, atmospheric nitrogen cannot be used directly by plants and animals. Nitrogen needs to be converted to nitrogenous compounds in order to be used by plants. This process of converting nitrogen into nitrogenous compounds is called nitrogen fixation.
It takes place by a certain kind of bacteria called rhizobium bacteria which live in the root nodules of leguminous plants. They convert atmospheric nitrogen to ammonia. Nitrifying bacteria then convert ammonia to nitrites and then nitrates. Some nitrogen fixation also occurs by lightning strikes.
The plants then take these nitrates from the soil. Plants use these nitrates for the synthesis of plant proteins and other compounds. Animals then eat these plants and get the proteins. Dead plants and animal excreta contain nitrogenous wastes. Overtime, these wastes decay and ammonia is released. Nitrifying bacteria once again convert the ammonia to nitrates. Some nitrates are again used by the plants and the cycle continues. Some nitrates are converted by denitrifying bacteria into atmospheric nitrogen. Thus, Nitrogen gas goes back to the atmosphere. As a result, the percentage of nitrogen in the air remains more or less constant. This cycle is known as Nitrogen Cycle
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Explore how ATP is made in 3 steps of aerobic cellular respiration with the Amoeba Sisters! This also compares this process to photosynthesis and introduces ATP structure. Check out our FREE video handouts on www.amoebasisters.com!
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In which Hank does some push ups for science and describes the "economy" of cellular respiration and the various processes whereby our bodies create energy in the form of ATP.
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Table of Contents:
1) Cellular Respiration 01:00
2) Adenosine Triphosphate 01:29
3) Glycolysis 4:13
A) Pyruvate Molecules 5:00
B) Anaerobic Respiration/Fermentation 5:33
C) Aerobic Respiration 6:45
4) Krebs Cycle 7:06
A) Acetyl COA 7:38
B) Oxaloacetic Acid 8:21
C) Biolography: Hans Krebs 8:37
D) NAD/FAD 9:48
5) Electron Transport Chain 10:55
6) Check the Math 12:33
TAGS: crashcourse, biology, science, chemistry, energy, atp, adenosine triphosphate, cellular respiration, glucose, adp, hydrolysis, glycolysis, krebs cycle, electron transport chain, fermentation, lactic acid, enzyme, hans krebs, citric acid, ATP synthase Support CrashCourse on Subbable: http://subbable.com/crashcourse
This channel is excellent for Biology students looking for some online revision. Made by an experienced biology teacher from my school ! Really useful! Covers a range of topics with great detail. Leaving cert focused material !