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Retina. Coloured scanning electron micrograph (SEM) of rods (yellow) and cones (green) in the retina of the eye. The outer nuclear layer is purple. Magnification x1800 when printed at 10 centimetres wide. [F0010041] Incredible!!

Credit: POWER AND SYRED/SCIENCE PHOTO LIBRARY Caption: Tomato stem. Coloured scanning electron micrograph (SEM) of the stem of a tomato plant (Lycopersicon lycopersicum).

Rods (green) are long nerve cells which respond to dim light, enabling images to be detected. Cones (blue) are shorter cone-like cells which detect colour. Rods and cones pass visual signals through the optic nerve to the brain. Pigment cells block light from passing further.

Scanning electron micrograph of a T4 bacteriophage. Viruses infect every known organism on Earth; these peculiar bug-like ones infect bacteria.

Diatom. Coloured scanning electron micrograph (SEM) of a Skeletonema punctatum diatom Heck yes! i love science :)

Inner ear hair cells. Coloured scanning electron micrograph (SEM) of sensory hair cells from the inner ear. These cells are surrounded by a fluid called endolymph. As sound enters the ear it causes waves to form in the endolymph, which in turn cause the hairs to move. The movement is converted to an electrical signal that is passed on to the brain. Each crescent-shaped arrangement of hairs lies atop a single cell.

Fertilization. Colored Scanning Electron Micrograph (SEM) of sperm clustered on the surface of a human egg during fertilization

This microscopic view is of a nerve broken open to reveal vesicles with chemicals used to pass messages.

A single ed blood cell on the tip of a needle, coloured scanning electron micrograph (SEM).

In this electron micrograph, a human white blood cell is trapping bacterial cells.

Nerve cells. Coloured scanning electron micrograph (SEM) of nerve cells, known as neurones. Nerve cells occur in the brain, spinal cord, and in ganglia. Each nerve cell has a large cell body (brown) with several long processes extending from it. The processes usually consist of one thicker axon and several thinner branched dendrites. The dendrites collect information in the form of nerve impulses from other nerve cells and pass it to the cell body.