Why do human osteocytes have more than one nucleus?
82647
osteoclasts break down bone, osteoctyes rejuvenate the bone.\nMultinucleation just the nature of the osteoclasts, just like a macrophage ( a large white blood cell that is multinucleated). However, each nucleus has the same genetic code.
955557
Osteocytes are replenished by the blood flow into your red bone marrow.
460607
Cells called osteocytes deposite collagen and release calcium phosphate which eventually hardens into a mineral called hydroxyapatite. This eventually forms a mineralized connetctive tissue which allows your muscles and other organs to attach themselves.
6209
At birth the human body has about 350 bones, but by the time adulthood arrives, some of the bones have fused together to give us a total of 206 bones in an adult body.
366238
Humans are born with 33 separate vertebrae. By adulthood, most have only 24, due to the fusion of the vertebrae in certain parts of the spine during normal development.
238596
My biology is a bit rusty but i believe that compact bone is the hard bone that forms the outer shell of any long bone.  Trabecular bone on the other hand is the lattice-like mesh that occupies the inside of bone.  As one ages and become elderly (i dont remember baby/kids/growing teen's physiology),  we loose more trabecular bone then compact bone.  There are many factors that accelerate this decline from hormones to excerise level to genetic factors.  Certain pathological conditions like osteoporosis and osteopenia are examples of what happens when we loose trabecular elements in  our bone.  With these conditions, our bones become weaker and more fagile and therefore more prone to develope fractures with minor falls.  Why do we loose more trabecular bone then compact bone?  I think this has to do with surface area.  Because trabecular bone is in the form of a lattice the surface area is much higher than that of compact bone and the chance to have calcium leeched away into the blood system is  much higher with trabecular bone than compact bone.
335803
Mature human RBC have no nucleus.\n\nMuscle cells have several, as a result of cells fusing together.
35330
The nucleus of an animal cell contains the DNA, a complete bluprint for creating an entire animal or when differentiated for creating specific tissue types.  The many genes in the nucleus could be pictured as a set of many ladders of various lenghts (rungs).  When the cell divides, half of each ladder collects in each new cell and regrows the missing halves.  The two halves are not identical, much like sawing the rungs of a real ladder on either side of the center and having rungs made of combinations of only four materials.  Actually, DNA is more like a twisted ladder, a helix.
70144
Bones are living tissue because bone cells continue to grow and regenrate throughout your life until you die. Every 3 years after you reach the age of 18 your bones completely regenerate until death.  As you are growing and especially around the stage of puberty, bones can regereate and generate new bone tissue in as little as 8 months. Bones are also the source of bone marrow. Red bone marrow is responsible for the production of red blood cells. White blood cells are produced by the lymphatic system.  \n\nHope this helps you some. feel free to ask anything else. \n\nTrisha Linton\nWichita Falls, Tx
951836
All cells have cell membranes.  They both have DNA and a lot of other stuff common to all life forms.  The main difference is that animal cells don't have cell walls but plant cells do.  If I were God, I would make animal bone cells have cell walls.  That would be cool.
56426
206.\n\nAt birth the human body has about 350 bones, but by the time adulthood rolls around, some of our bones have fused together to give us a total of 206 bones in our body!\n\n28 skull bones\n\nthe horseshoe-shaped hyoid bone of the neck; \n\n26 vertebrae\n\n24 ribs plus the sternum or breastbone(2 clavicles, the most frequently fractured bone in the body, and 2 scapulae)\n\n the pelvic girdle (2 fused bones); \n\n30 bones in our arms and legs (a total of 120); \n\nThere are also a few partial bones, ranging from 8-18 in number, which are related to joints.\n\nBasically, there are 7 vertebrae and the hyoid bone in the neck.
413523
calcium is mainly used to strengthen your bones so when you get older theres a less chance that you get osteoporosis
500426
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.
92432
The prokaryote cell does not contain a nucleus. Prokaryote cells are only one celled organisms.\nEukaryote cells can be of one celled organisms, or multi-celled (like you and me). Eukaryote cells contain mitocondria, I don't beleave prokaryotes do.
289433
Increasing evidence suggests nonrandom localization of DNA sequences in the cell nucleus. Changes in intranuclear gene location as a function of transcriptional activity has been established in several experimental systems
102110
A typical adult human skeleton consists of the following 206 bones.\nIn the skull (22):\n\nCranial bones: \n1. frontal bone \n2. parietal bone (2) \n3. temporal bone (2) \n4. occipital bone \nsphenoid bone \nethmoid bone \nFacial bones: \n5. zygomatic bone (2) \n6. superior and inferior maxilla \n9. nasal bone (2) \n7. mandible \npalatine bone (2) \nlacrimal bone (2) \nvomer bone \ninferior nasal conchae (2) \nIn the middle ears (6):\n\nmalleus (2) \nincus (2) \nstapes (2) \nIn the throat (1):\n\nhyoid bone \nIn the shoulder girdle (4):\n\n25. clavicle or collarbone (2) \n29. scapula or shoulder blade (2) \nIn the thorax (25):\n\n10. sternum \n28. ribs (2 x 12) \nIn the vertebral column (24):\n\n8. cervical vertebrae (7) incl. atlas & axis \n14. lumbar vertebrae (5) \nthoracic vertebrae (12) \nIn the arms (6):\n\n11. humerus (2) \n26. condyles of humerus \n12. ulna (2) \n13. radius (2) \n27. head of radius \nIn the hands (54):\n\nWrist (carpal) bones: \nscaphoid bone (2) \nlunate bone (2) \ntriquetrum bone (2) \npisiform bone (2) \nTrapezium (bone) (2) \ntrapezoid bone (2) \ncapitate bone (2) \nhamate bone (2) \nPalm or metacarpal bones: \nmetacarpal bones (5 × 2) \nFinger bones or phalanges: \nproximal phalanges (5 × 2) \nintermediate phalanges (4 × 2) \ndistal phalanges (5 × 2) \nIn the pelvis (4):\n\n15. ossa coxa (hip bones or innominate bones) (2) \n16. sacrum \ncoccyx \nIn the legs (8):\n\n17. femur (2) \n22. greater trochanter of femur \n23. condyles of femur \n19. patella (2) \n20. tibia (2) \n21. fibula (2) \nIn the feet (52):\n\nAnkle (tarsal) bones: \ncalcaneus (heel bone) (2) \ntalus (2) \nnavicular bone (2) \nmedial cuneiform bone (2) \nintermediate cuneiform bone (2) \nlateral cuneiform bone (2) \ncuboidal bone (2) \nInstep bones: \nmetatarsal bone (5 × 2) \nToe bones: \nproximal phalanges (5 × 2) \nintermediate phalanges (4 × 2) \ndistal phalanges (5 × 2) \nThe infant skeleton has the following bones in addition to those above:\n\nsacral vertebrae (4 or 5), which fuse in adults to form the sacrum \ncoccygeal vertebrae (3 to 5), which fuse in adults to form the coccyx \nilium, ischium and pubis, which fuse in adults to form the pelvic girdle
305995
THE FIVE MAJOR FUCTIONS OF THE SKELETAL SYSTEM\n1st:The skeleton gives shape and support to your body\n2nd:bones protect your internal organs.For example,ribs surround the heart and lungs, and the skull encloses the brain.\n3nd:Major muscles are attached to bone and help them move\n4th:Blood cells are formed in the center of many bones in soft tissue called red marrow.\n5th:Major quantities of calcium and phosphorous compounds are stored in the skeleton for later use.Calcium and phosphorous make bones hard.