What are the life spans of these cells : skin, red blood, muscle, nerve, fat, liver, egg and sperm cells?
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Red Blood Cells have an average life span of 120 days.\n\nsorry that I couldn't find more... but I hope that helps at least a small bit...
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All living cells change every 7 to 10 years. Bones, muscles, fat, etc. Even the enamel on your teeth undergoes a slow change.\n\nBones have living cells that continually decompose the mineral matrix of ol bone an dutilize the calcium for your boy while other cells are laying down a new matrix at the same time.\n\nOur blood recycles every 30 days give or take. The cells in our muscles are repalced and added to or subtracted as needed. That is one of the reasons why you can get buff and cut and not work out for 10 months and not be as strong as before.\n\nThe part about the vitrious humour of the eye is also correct. Thsi is a liquid produced by cells lining this area. These cells are repalced, but the fluid remains MOSTLY unchanged. If you have a leak due to injury the body will replenish it slowly. It is often used to test for time of death, and for poisonings as it is not easily cycled from the body.
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The glands include: the adrenal glands, the pituitary gland, the hypothalamus, the thyroid glands, the parathyroid glands, the testes/ovaries, and the pineal gland.  Some also consider the liver, heart, skin, etc glands because they can secrete hormones.\n\n\nTry the link.
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cALCIUM, vITAMINS, tISSUE ETC.
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1. Nucleus\n2. Food Vacuole\n3. Contractile Vacuole\n4. Cytoplasm\n5. Psedopod\n6. Cell membrane
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Adenine, Guanine, Cytosine, and Thymine
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150 sperm cells....\nbecause each secondary spermatocyte shall become a spermatid each...and each spermatid produces a sperm cell.... therefore, a sec. spermatocyte only produces a single sperm cell...
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Red blood cells(eritrocyte)-Hemoglobin\n\nWhite blood cells(leucocyte)-\n1. granulocyte-lymphatic vessels and monocyte\n2. agragranulocyte- neutrophil,basophil,eosinophil\n\nPlatelets(thrombocytes)
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there's 9, not 7: digestion, respiration, reproduction, circulation, excretion, movement, control, coordination, and immunity
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A human parental cell (or germ cell) has 46 chromosomes or 23 pairs (2n).
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lipids\ncarbohydrates\namino acids/proteins\nnucleic acids
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Total life span=8billon+yrs.\nIt may last for another 4.5 billion years.....(and counting)
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Organs:\n1.  Brain\n2.  Voice Box\n3.  Lungs\n4.  Heart\n5.  Liver\n6.  Spleen\n7.  Stomach \n8.  Kidnets\n9.  Large Intestine\n10. Small Inestine\n11. Skin\n12. Bladder\n13. Gallbladder\n14. Pancreas\n15. Female/Male Genitals\n16. Appendix\n\nOrgan Systems:\n1.  Circulatory\n2.  Digestive\n3.  Endocrine\n4.  Integumentary\n5.  Muscular \n6.  Nervous: \n7.  Reproductive\n8.  Respiratory \n9.  Skeletal\n10. Urinary/Excretory: \n\nthere's 12 but I left out 2, sorry, dont want to double check to find the other two, look urself...
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http://www.wonderquest.com/LifeSpan-MaxMin.htm
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Skin\nLiver\nBrain\nLungs (paired)\nHeart\nIntestines
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Cells that have entered the G0 phase of the mitotic cycle. In the human body, this includes nervous cells, muscle cells, brain cells (practically the same as nervous cells) and various osteoblasts that have already formed bone.
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Red blood cells or Rbc are produced in your red bone marrow of your sternum, your chest bone. They have a lifespan of about 120 days. Then as then get old, these blood cells enter the spleen (also called the red splenic pulp) where it is forced through small pores. So that causes the rbc to be broken down physically. Then the hemoglobin in RBc is transferred to the liver by combining with a protein called haptaglobin an the hemoglobin is furthur broken down.\n\nThe protein in the RBC (alpha and beta chains) are broken down in the liver into amino acids. Iron in the hemoglobin is also either stored or reused by the liver.