Areas of the lungs outside the alveoli where gas exchange with the blood does not take place. During adulthood, explain why vital capacity changes with age. As one ages, the elastic fibers in the lung gradually decrease as well. elastance and greater compliance of the lungs.
Brain aneurysm: An mri/mra of the brain is an excellent screening test for the detection of even small (2-3 mm) brain aneurysms. Some neurosurgeons may recommend a ct angiogram of the brain or even a cerebral angiogram to be absolutely sure of the initial test results. Discuss the best option for you with a cerebrovascular neurosurgeon.
Magnetic resonance angiogram (MRA) of blood vessels. Magnetic resonance angiogram (MRA) of blood vessels. Courtesy of Intermountain Medical Imaging, Boise, Idaho. Figure 1 and Figure 2 show MRAs of the normal smooth appearance of the large blood vessel (aorta) that carries blood from the heart. Figure 3 shows an MRA of a narrowed and abnormal aorta from the buildup of calcium and fat (cholesterol) in the inner lining of the artery, often called hardening of the arteries (atherosclerosis).