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Because the practical and ethical constraints are very different

Through the countercurrent multiplier system

the LC projects axons to virtually every brain region and provides the primary noradrenergic input to the cortex

The gyri and sulci of the human cortex map directly to functional regions: motor cortex along the central sulcus

red blood cells necklace L | gold vermeil cufflinks Because the practical and ethicalred blood cells necklace L 18k gold vermeil Red blood cells shed their nucleus to make room for 270 million hemoglobin molecules. A biconcave disc 7 8 micrometers across, made to flow through capillaries thinner than itself. Life depends on a shape that optimizes oxygen delivery with nowhere left to spare. The Science of the Red Blood Cell Erythrocytes are among the most specialized cells in the body, lacking a nucleus and all organelles except