Activation Energy is the amount of energy required for a reaction to take place. As a reaction takes place two molecules approach each other and then repel, the energy required to force the two particles to collide is activation energy, the particles then get close enough to rearrange the electron shells. Using a catalyst lowers the amount of activation energy required for the electrons to be rearranged.
Be sure to eat little or no red or processed meat and limit intake of cholesterol and saturated fats. Minimize salt intake to support healthy blood pressure. Other measures taken to help reduce the risk of stroke include: In addition, arterial surgery can also be used to lower the risk of repeat strokes, as well as some other surgical options still being studied.
Types There are three main types of stroke: This is the most common type of stroke. A blood clot prevents blood and oxygen from reaching the brain.
This occurs when a weakened blood vessel ruptures and normally occur as a result of aneurysms or arteriovenous malformations AVMs.
Transient ischemic attacks TIAs: Also referred to as a mini-strokethese occur after blood flow fails to reach part of the brain. Normal blood flow resumes after a short amount of time, and symptoms cease. Causes The different types of stroke have different causes. However, stroke is more likely to affect people if they have the following risk factors: Ischemia is severely reduced blood flow that damages brain cells.
These blockages are often caused by blood clots, which can form in the brain arteries. They can also occur in other blood vessels in the body before being swept through the bloodstream and into narrower arteries in the brain.
Fatty deposits within the arteries called plaque can cause clots that result in ischemia. Hemorrhagic stroke Hemorrhagic strokes are caused by arteries in the brain either leaking blood or bursting open.
Leaked blood puts pressure on brain cells and damages them.
It also reduces the blood supply that can reach the brain tissue after the hemorrhage. Blood vessels can burst and spill blood into the brain or near the surface of the brain, sending blood into the space between the brain and the skull.
The ruptures can be caused by conditions including hypertensiontrauma, blood-thinning medications, and aneurysms. Aneurysms are weaknesses in the walls of blood vessels. Intracerebral hemorrhage is the most common type of hemorrhagic stroke and occurs when brain tissue becomes flooded with blood after an artery in the brain bursts.
Subarachnoid hemorrhage is the second type of hemorrhagic stroke and is less common. In this type of stroke, bleeding occurs in the area between the brain and the thin tissues that cover it.
Transient ischemic attack TIA TIAs are different from the types above because the flow of blood to the brain is only briefly interrupted.
TIAs are similar to ischemic strokes in that they are often caused by blood clots or other clots. They should be regarded as medical emergencies, even if the blockage of the artery and its symptoms are temporary. They serve as warning signs for future strokes and indicate that there is a partially blocked artery or clot source in the heart.
Between 10 and 15 percent of people will have a major stroke within 3 months of a TIA. Symptoms Symptoms of a stroke often appear without warning. The main symptoms of stroke are: Depending on how quickly it is diagnosed and treated, an individual can experience temporary or permanent disabilities in the aftermath of a stroke.
In addition to the persistence of the problems listed above, people may also experience the following: If the person tries to smile, does one side of the face droop? If the person tries to raise both their arms, does one arm drift downward?
If the person tries to repeat a simple phrase, is their speech slurred or strange? Time to call If any of these signs are observed, contact the emergency services.
The faster a person with suspected stroke receives medical attention, the better their prognosis will be, and the less likely they will be to experience permanent damage or death.
Diagnosis Signs of a stroke require immediate medical attention. Strokes onset rapidly and will often occur before an individual can be seen by a doctor for a proper diagnosis.
For a person experiencing a stroke to get the best diagnosis and treatment possible, they should be treated at a hospital within 3 hours of their symptoms first appearing.The Project Gutenberg EBook of Moby Dick; or The Whale, by Herman Melville This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever.
Rate of Reaction Between Calcium Carbonate and Hydrochloric Acid Essay - Rate of Reaction Between Calcium Carbonate and Hydrochloric Acid Plan: In my experiment I will measure the rate of reaction between calcium carbonate and hydrochloric acid.
I will have to get a conical flask and put 50cm of Sodium Thiosulphate into the conical flask. Then I will put 5cm Hydrochloric Acid into the flask. Then I will time how long it takes for the image of the picture to be completely obscured by the build up of sulphur.
Science Essays: Titration. Search Browse Essays ; Join now! Login; Support; Tweet; Browse Essays The volume of sodium hydroxide to complete neutralization were determined by the mixture in the conical flask to change colour. 20mL of orange juice and 3 drops of phenolphthalein were put in a conical flask.
Sodium hydroxide solution were /5(1). A mL conical flask A 4 decimal place electronic balance Distilled water A mL beaker A dropper Tissue paper Procedure: 1) The conical flask was weighted with the balance and the value was recorded.
2) The beaker was filled with distilled water and the water was added into the conical flask up to . Reflective journal nursing Essay Sample. The whole doc is available only for registered users OPEN DOC. Pages: Word count: ; Ammonium hydroxide was then titrated slowly into the conical flask and the conical flask words 6 pages.
Read More. Production of sulphur dioxide.