Tag Archives: false color SEM

Alveoli SEM

An alveolus (plural: alveoli, from Latin alveolus, “little cavity”) is an anatomical structure that has the form of a hollow cavity. Found in the lung parenchyma, the pulmonary alveoli are the terminal ends of the respiratory tree, which outcrop from either alveolar sacs or alveolar ducts, which are both sites of gas exchange with the blood as well. (from Wikipedia)

Image from post-mitotic tumblr (link). Image by David Gregory and Debbie Marshall

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Intestinal Bacteria

The human gut teems with bacteria, many of their species still unknown. They help us digest food and absorb nutrients, and they play a part in protecting our intestinal walls. Gut bacteria may also help regulate weight and ward off autoimmune diseases. (from national geographic)

Image from nationalgeographic.com (link).           Photo credit: Martin Oeggerli with support from School of Life Sciences FHNW.

wallpaper image (link)

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Taste Buds SEM

This image shows the intricate pattern of minute surface projections (papillae). The more numerous are filiform papillae (purple), also known as conical papillae, which have mechanical and tactile (touch) functions. These papillae also form a rough surface which helps in the chewing and manipulation of food. Fungiform papillae (round, red) are less numerous, and are well supplied with blood; they contain taste buds under their surface, thus playing a sensory role.

Image from Fineartamerica.com (link).    photograph by Omikron and photo Researchers.

Color-enhanced scanning electron micrograph showing taste buds on the surface of the human tongue.

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Synaptic Transmission

Ever wondered how sensory and motor functions are accomplished by the nerves? These are carried out by a process called neurotransmission or synaptic transmission between nerve endings. Nerve endings possess vesicles containing neurotransmitters which are signalling molecules released during transmission of signals between nerve endings. To propagate signals for motor or sensory functions the released neurotransmitters bind to the adjoining nerve ending and cause a series of cell changes that result in nerve impulses. These ultimately lead to muscle action, release of bodily secretions and other organ functions.

The orange and blue vesicles in this image captured by scanning electron microscopy contain neurotransmitters that are released from nerve endings (green) during synaptic transmission. (from Brighthub.com – link)

Image source: brighthub.com

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