Blood Under an Electron Microscope. The adult human body is composed of around 50 trillion cells - >8000 times more than all the people there are on this planet! And all these cells of different types get along and work together, making us who we are. Thanks cells.
Human blood with red blood cells, 3 T-lymphocytes, and activated platelets. Dennis Kunkel Microscopy, Inc/Visuals Unlimited, Inc.
This microscopic look at human blood reveals that nearly half of our blood is composed of red blood cells. These lozenge-shaped cells have the all-important role of delivering oxygen to our tissues. T cells (orange) are an essential part of the immune system. Platelets (green), the smallest blood cells, clump together into clots to stanch bleeding after an injury.
Colorized scanning electron micrograph of a red blood cell infected with malaria parasites (blue). The infected cell is in the center of the image area. To the left are uninfected cells with a smooth red surface.
The Cell (January 2011) How can cells grow and develop to form complex creatures? In this issue we explore the secrets of the cell. Our free poster shows a typical animal cell and reveals some surprising statistics. Order a copy or download [PDF].