Kidney ultrasound. Also called: renal ultrasound. A kidney ultrasound is used to determine the size, shape and location of the kidneys without cutting the skin. A kidney ultrasound makes it possible to see the kidneys from outside the body by using ultrasonic waves.
An early recognized function of astrocytes is the control of K + levels in the brain. Neuronal activity leads to an increase in K + concentration from a resting level of about 3 mM to a maximum of 10 - 12 mM under physiological conditions and to even higher values under pathological conditions.strocytes may also limit the number of synapses since astrocyte membranes can ensheath the neuronal processes and thus compete with synapses. Astroglial cells can also be involved in the elimination of synapses in the CNS, the process which underlies the final tuning and plasticity of the neuronal inputs.
Astrocyte Regulation of Blood Flow. in the Brain. Brian A. MacVicar1 and Eric A. Newman2. 1Djavad Mowafaghian Centre for Brain Health, Department of Psychiatry, University of British Columbia, Vancouver, British Columbia V6T 2B5, Canada. 2Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455.