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Aortic Aneurysms

An aneurysm is a bulge or weakness in a blood vessel.Aneurysms usually occur in the blood vessels of the brain or the aorta.There are changes in the proportion of elastin and collagen in the artery wall. Scientists have found that the ratio of collagen to elastin changes from 1.85:1 to about 3.75 to 1 and 7.91:1 in large aneurysms.High blood pressure increases the risk of an aneurysm.

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Specification: OCR Biology A (H020), AS-level, 3.1.2 Transport in animals. Topic: Transport in Animals.

Key terms in this lesson

elastin
A protein that gives connective tissue, such as artery walls, the ability to stretch and recoil.

More in Transport in Animals

All 32 lessons in Transport in Animals · All OCR AS-level Biology topics