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lecture 3

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Ted Petit

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Lecture 3: Brains and Behavior The Kinds of Things that Go Wrong in the Brain Problems with Blood Flow Blockage in blood vessels o When there is a blockage in the blood flow, there is usually two things that blood carries in it is oxygen and sucrose to keep the cells alive. Oxygen is the most important because a person can only stay without oxygen for about 3 minutes. The brain is very active metabolically so if it runs out of oxygen it gets in deep trouble. Often we can get other organs in the body that can survive much better without a blood supply. If you get your finger cut off, you can put in back together. However, 3 minutes without oxygen, you can just call it quits. It has a very high metabolic rate, it has a very high metabolic requirement, so a very short period without oxygen can be devastating for the brain. A person with a hear attach if the persons hearts stop beating and it takes too long for the blood to flow to the brain, and the person recovers from that. If the recovery wasnt quick enough than the body would be fine, however they might suffer from some sort of brain damage. If there is glucose deprivation, a person gets really cold. It is not a neuropathic thing, it is just that a person gets sweaty and cold. However the thing to know is that this sort of deprivation is different from oxygen deprivation. One being that everything needs oxygen and also oxygen doesnt have any storage place in the body where as glucose does. o Types of problems; Cerebral vascular accident (fast): also known as the CVA. They are more commonly as a stroke. It is a severe interruption of blood supply to the brain. This interruption of blood supply results in ischemia. It means that there is a problem in the blood supply, or there is not enough blood. Since oxygen is the primary element for the brain, ischemia can also mean that there is an interruption of oxygen supply in the brain. This then produces dead or dying tissue which is called an infarct. Encephomalacia (slower): lack of blood supply but it is very slow. It is a long term blockage of some arteries. The brain tissue becomes damaged. Is induced but a very slow rate of blood supply. When this happens you will see the softening of the brain tissue. This tissue as a whole is not dead however there are some deaths. There might be some swelling. There is some damaged due to a generalized lack of
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