Blood clotting. Human red blood cells (erythrocytes, red) and platelets (thrombocyte, white) forming a blood clot. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Platelets secrete chemicals that promote the accumulation of fibrin (not seen) and other blood components required for clot formation. Magnification: x7000 when printed 10cm wide.

Blood clotting. Human red blood cells (erythrocytes, red) and platelets (thrombocyte, white) forming a blood clot. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Platelets secrete chemicals that promote the accumulation of fibrin (not seen) and other blood components required for clot formation. Magnification: x7000 when printed 10cm wide.

Macrophage engulfing TB bacteria. Coloured scanning electron micrograph (SEM) of a macrophage white blood cell (purple) engulfing a tuberculosis (Mycobacterium tuberculosis) bacterium (pink).

Macrophage engulfing TB bacteria. Coloured scanning electron micrograph (SEM) of a macrophage white blood cell (purple) engulfing a tuberculosis (Mycobacterium tuberculosis) bacterium (pink).

Nerve bundle. Coloured scanning electron micrograph (SEM) of a freeze-fractured section through a bundle of myelinated nerve fibres. Myelin sheaths (yellow) can be seen surrounding the axons (blue). Perineurium (connective tissue, pink) surrounds the nerve bundle while endoneurium divides the individual fibres.

Nerve bundle. Coloured scanning electron micrograph (SEM) of a freeze-fractured section through a bundle of myelinated nerve fibres. Myelin sheaths (yellow) can be seen surrounding the axons (blue). Perineurium (connective tissue, pink) surrounds the nerve bundle while endoneurium divides the individual fibres.

I love how you can see the cells embedded in/passing through the vein wall. Ruptured venule under scanning electron microscope.

I love how you can see the cells embedded in/passing through the vein wall. Ruptured venule under scanning electron microscope.

Axones nerviosos - A cross section of a bundle of nerve fibers.  Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells.  Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Axones nerviosos - A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Inner ear balance sensing. Coloured scanning electron micrograph (SEM) of bundles of cilia (hair cells, yellow) and otoliths (round, red) in the human inner ear. The cilia and otoliths detect directional movement, such as the tilting of the head. They are immersed in a fluid, called the endolymph. Currents in this fluid displace the position of the cilia and otoliths, triggering nerve impulses that are sent to the brain through the vestibular nerve.

Inner ear balance sensing. Coloured scanning electron micrograph (SEM) of bundles of cilia (hair cells, yellow) and otoliths (round, red) in the human inner ear. The cilia and otoliths detect directional movement, such as the tilting of the head. They are immersed in a fluid, called the endolymph. Currents in this fluid displace the position of the cilia and otoliths, triggering nerve impulses that are sent to the brain through the vestibular nerve.

This is a scanning electron microscope image from normal circulating human blood.

This is a scanning electron microscope image from normal circulating human blood.

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