BIOS1167 Lecture Notes - Lecture 5: Extracellular Fluid, Epithelium, List Of Lakes By Volume
4 Sep 2018
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Tissues: muscle tissue (generate force), epithelial tissue (lining of cavities), connective tissue(support body structures), neural tissue (nerves) The smallest functional unit capable of body processes. Homeostasis attempts to control number of cells through > cell death (apoptosis) and cell division (50 trillion and constantly being turned over) Sex cells (gametes) female = ova, ovum, oocyte male = sperm cells (haploids 23 single chromosomes) Somatic cells all other cells in the body (besides rbc no nucleus) (diploid 23 pairs of chromosomes) Growth, development, energy production (cellular metabolism), energy consumption, waste excretion, response to environment (nerve cells), control of internal environment (homeostasis) Largest = oocyte (female egg 0. 10mm), small cell = rbc (0. 008mm) Leucocytes = few hours produced by bone marrow and lymph nodes. Cells of intestinal lining = 3 days. Red blood cells = 120 days (no capacity for cell division, no nucleus) Neurons = lifetime (don"t regenerate non-dividing cells.
