Transcript File
Cells By Dr. A. George Robert Hooke, 1665 The Cell in 1665 Hooke didn’t guess that the cell is the fundamental building block of living things. Anton van Leeuwenhoek discovers ‘Animalcules’ in the 1670s “I well know there are whole Universities that won't believe there are living creatures in the male seed : but such things don't worry me – I know I'm in the right.” First sighting of Red Blood Cells – van Leeuwenhoek, 1719 Franz Bauer discovers the Nucleus in 1802 The Cell in 1802 Matthais Schleiden & Theodor Schwann, 1839 Every part of the structure of plants and animals is made from cells or the products of cells. More Features of Plant Cells 1835 – Vacuoles discovered 1864 – Chloroplasts discovered View of Cells in 1865 Animal Cell Plant Cell cell membrane cytoplasm nucleus cell wall chloroplast vacuole Mitochondrion (pl. Mitochondria) Discovered in 1850s; function not proven until 1950s. The powerhouse of the cell. Ribosomes Discovered in 1950s Ribosomes make proteins The Cell in 1955 – and in your GCSE cell membrane cytoplasm nucleus mitochondrion (produces energy) ribosome (makes proteins) Casts of real human blood vessels, made using a technique called ‘corrosion casting’, in which blood vessels are injected with a coloured plastic which sets hard. The body tissue is then chemically removed. As seen at ‘Bodies: the Exhibition’. Cast of blood vessels in a greyhound heart. Did you know? • In most tissue, no cell is ever more than three or four cells away from a blood vessel. • Yet the vessels and blood take up no more than about 5% of the body’s volume. • The total length of an adult’s blood vessels is over 62,000 miles.