Why is easy bruising so common in older adults? Most bruises form when small blood vessels (capillaries) near the skin's surface are broken by the impact of a blow or injury â often on the arms or legs. When this happens, blood leaks out of the vessels and initially appears as a black-and-blue mark. Eventually your body reabsorbs the blood, and the mark disappears.
HeLa cell. HeLa cell, a cancerous cell belonging to a strain continuously cultured since its isolation in 1951 from a patient suffering from cervical carcinoma. The designation HeLa is derived from the name of the patient, Henrietta Lacks.
In these cell types, the cell volumes are captured by a rule of thumb value of 2000 Âµm 3 with a range of 500-4000 Âµm 3 3 with a variance of about 300 Âµm 3. To put these cellular sizes in perspective, if we think of E. coli as having the size of a human being, then a HeLa cell is about the size of a blue whale. human is, according to the most recent estimates, an assortment of 3.7Â±0.8Ã10 13 cells (BNID 109716), plus a similar complement of allied microbes.