At other times, the vasomotor center makes the blood vessels get wider. This makes the blood pressure go down, and makes it easier for blood to get to some parts of the body.
The medulla also controls some important reflexes, like vomiting, coughing, sneezing, and swallowing.
Sets of neurons in the medulla help control other important things, like movement, digestion, and sleep.
Because the medulla controls so many important things, injuries to the medulla can cause some serious problems.
For example, an injury to the middle of the medulla can cause these symptoms:
An injury to one side of the medulla can cause these symptoms:
If a person's medulla is completely destroyed (for example, from a very bad injury, or because it did not get enough oxygen to survive), that person will die.
Tin(II) bromide
Tin(II) bromide, also known as stannous bromide, is a chemical compound. Its chemical formula is SnBr. It contains tin and bromide ions. The tin is in its +2 oxidation state.
Tin(II) bromide is a yellowish solid. Its color is between the bright orange tin(II) iodide and the colorless tin(II) chloride. It is a reducing agent.
It is made by reacting tin or its oxide with hydrobromic acid.
Tin(II) bromide is used to make organic compounds with tin atoms attached.
Tin(IV) bromide
Tin(IV) bromide, also known as stannic bromide, is a chemical compound. Its chemical formula is SnBr. It contains tin and bromide ions. The tin is in its +4 oxidation state.
Tin(IV) bromide is a colorless solid. It melts easily. It is soluble in water.
Tin(IV) bromide is made by reacting tin with bromine.
Tin(IV) fluoride
Tin(IV) fluoride, also known as stannic fluoride, is a chemical compound. Its chemical formula is SnF. It contains tin and fluoride ions. The tin is in its +4 oxidation state.
Tin(IV) fluoride is a colorless solid. Its melting point is very high. It reacts with alkali metal fluorides like potassium fluoride to make hexafluorostannates, compounds that have the SnF ion in them.
Tin(IV) fluoride is made by reacting tin and fluorine. It can also be made by reacting hydrogen fluoride with tin(IV) chloride.
It is sometimes used in toothpaste, although tin(II) fluoride is more common.
Tin(II) sulfide
Tin(II) sulfide, also known as stannous sulfide, is a chemical compound. Its chemical formula is SnS. It contains tin and sulfide ions. The tin is in its +2 oxidation state.
Tin(II) sulfide is a dark brown solid. It is rarely found as a mineral. It does not dissolve in water but dissolves in concentrated hydrochloric acid.
Tin(II) sulfide is made by reacting tin with sulfur. It can also be made by reacting tin(II) chloride with hydrogen sulfide.
Tin(IV) sulfide
Tin(IV) sulfide, also known as stannic sulfide, is a chemical compound. Its chemical formula is SnS. It has tin and sulfide ions in it. The tin is in its +4 oxidation state.
Tin(IV) sulfide is a gold-colored or brown solid. It reacts with strong acids to make hydrogen sulfide.
Tin(IV) sulfide is made by reacting hydrogen sulfide with tin(IV) compounds such as tin(IV) chloride.
It is used as a decorative coating because of its color. This coating is known as mosaic gold.
Tin(II) fluoride
Tin(II) fluoride, also known as stannous fluoride, is a chemical compound. Its chemical formula is SnF. It contains tin and fluoride ions. The tin is in its +2 oxidation state.
Tin(II) fluoride is a colorless crystalline solid. It dissolves in water. It is a reducing agent. It can be oxidized to solid tin(IV) fluoride, which does not work for dentistry.
It is made by reacting tin or its oxide with hydrofluoric acid.
It is commonly used in toothpastes as a source of fluoride ions. The fluoride ions react with the enamel of the tooth, making it harder to attack by bacteria. It also stops gingivitis. Some mouthwashes have tin(II) fluoride in them.
Foreign reserve
A foreign reserve is the currency from another nation that is held by a nation's treasury. They are another set of assets in a country. Formerly, only gold and silver were used as reserves, but now the currency of other countries is used. There is a benefit to having a foreign reserve. When a nation has one, it can change the exchange rate to make it best for the country. But sometimes the exchange rate drops and the foreign reserve becomes worthless.
Cerebral cortex
The cerebral cortex is a most important part of the brain. In humans, it is by far the largest part of the brain.
Though this cannot be seen directly, different parts of the cortex have different functions (see diagram). It plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness.
It is a sheet of neural tissue that is outermost to the cerebrum of the mammalian brain. It has up to six layers of nerve cells. The human cerebral cortex is 2–4 mm (0.08–0.16 inches) thick.
In preserved brains, it is grey, so it is often called 'grey matter'. In contrast to gray matter that is formed from neurons and their unmyelinated fibers, the white matter below them is formed predominantly by myelinated axons interconnecting neurons in different regions of the cerebral cortex with each other and neurons in other parts of the central nervous system.
The surface of the cerebral cortex is folded in large mammals, such that more than two-thirds of it in the human brain is buried in the grooves.
The phylogenetically most recent part of the cerebral cortex, the neocortex, has six horizontal layers; the more ancient part of the cerebral cortex, the hippocampus, has at most three cellular layers. Neurons in various layers connect vertically to form small microcircuits, called 'columns'.
The neocortex is the newest part of the cerebral cortex to evolve. The six-layer neocortex is a distinguishing feature of mammals; it has been found in the brains of all mammals, but not in any other animals. In humans, 90% of the cerebral cortex is neocortex.
Other parts of the cerebral cortex are:
The cellular organization of the old cortex is different from the six-layer structure mentioned above.
A Matter of Life and Death
A Matter of Life and Death is an album by Iron Maiden. It is their fourteenth album and went on sale on 5 September 2006.
The album talks a lot about war and death, as well as other parts of life. It was produced by Kevin Shirley.
It is a popular album, and sold within the top ten most popular album in several countries when it was released. It was the first Iron Maiden album to do this in the United States.
Playful Kiss
Mischievous Kiss (also known as Playful Kiss / It Started with a Kiss) is a Korean television series based on the popular anime/manga called "Itazurana Kiss". It has 14 episodes with more than 8 subtitles.
It is about a clumsy student named Oh Ha Ni. She is a senior student from Section F who has a very low IQ. Oh Ha Ni fell in love with the perfectionist Baek Seuk Jo. Baek has an IQ of 200 and is from section A. When Oh Ha Ni decided to Baek Seung Jo she loved him, he rejected her in front of the entire school. This embarrassed her. When Oh Ha Ni’s house is destroyed, they moved to her father’s long-time friend who turns out to be Baek Seung Jo’s dad. Now that they lived in the same house.
One World Film Festival
One World is a movie festival that takes place each year in Prague, Czech Republic. The theme of the festival is human rights documentary movies. The Czech organization People in Need organizes the festival. People can watch about 130 documentary movies from almost 40 countries during one week. Every year "One World" focuses on a different human rights issue or problem. The festival also offers other events, such as debates with filmmakers and photography exhibitions. The festival is at the end of April each year.
People In Need