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Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.

Teachers Pay Teachersfrom Teachers Pay Teachers

Muscular System Lesson

I like to bring in a rope to show how muscles are like bundles of rope. The fibers form bundles, and small bundles form larger bundles and so on. Link to muscular system lesson enclosed.


The Wars Within


the Guardianfrom the Guardian

Art of science: extremely small, incredibly close

Surface of the Human Brain

✯ HeLa cells are a continuously cultured cell line of human cancer cells, which are immortal thrive in the laboratory. They are widely used in biological and medical research. The spherical cell at centre is undergoing apoptosis (programmed cell death). Apoptosis occurs when a cell becomes old or damaged. Blebs (vesicles) called apoptotic bodies form on its surface, which prevent toxic or immunogenic substances from leaking when it is phagocytosed (engulfed and digested) by specialist…

Scanning electron microscope view of lung alveoli, magnified × 750, showing the way in which their shape is retained as their size alters with changes in lung volume.

Synapse. SEM of a neuromuscular junction showing a motor neuron (orange) terminating on skeletal muscle fibers (pink).

Chapter 1: Paramecium multimicronucleatum - Cortex and Cilia -- 00-pm -- Fig 0: Paramecium cells

Macrophage (red) engulfing tuberculosis bacteria (yellow), taken with ZEISS FE-SEM. Courtesy of Dr. Volker Brinkmann, Max Planck Institute for Infection Biology, Berlin/ Germany.

Cochlea from Inner Ear. Color-enhanced scanning electron micrograph of the inside of a guinea pig inner ear showing the hearing organ, or cochlea. Running along the spiral structure are rows of sensory cells which respond to different frequencies of sound. The whole organ is just a few millimeters long.