diagram of a red blood cell
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Answers:Mature red blood cells in mammals do not have nuclei or other organelles. This allows them to carry more hemoglobin. A mammalian red blood cell is a membrane surrounding a lot of hemoglobin protein. Your model probably just needs to show the shape. There isn't much to label.
Answers:DNA - is the genetic code which ensures that daughter cells inherit the same characteristics as the parent cells, it is the code from which all protein is synthesized. Cytoplasm - The cytoplasm plays a mechanical role, eg: to maintain the shape, the consistency of the cell and to provide suspension to the organelles. Nucleus - The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during the cell cycle. The nucleus provides a site for genetic transcription that is segregated from the location of translation in the cytoplasm. cell membrane - The cell membrane surrounds the protoplasm of a cell and in animal cells physically separates the intracellular components from the extracellular environment. Fungi, bacteria and plants also have the cell wall which provides a mechanical support for the cell and precludes passage of the larger molecules. The cell membrane also plays a role in anchoring the cytoskeleton to provide shape to the cell, and in attaching to the extracellular matrix and other cells to help group cells together to form tissues. The barrier is differentially permeable and able to regulate what enters and exits the cell, thus facilitating the transport of materials needed for survival. as for the nerve cells that is allot of info your asking for so I suggest that you look it up your self text books are best but here are some links that should help. http://www.google.de/imgres?imgurl=http://www.naturalhealthschool.com/img/nervecell.gif&imgrefurl=http://www.naturalhealthschool.com/9_2.html&h=354&w=400&sz=10&tbnid=2Kyol9XJCQ-t_M:&tbnh=110&tbnw=124&prev=/images%3Fq%3Dnerve%2Bcells&zoom=1&q=nerve+cells&hl=de&usg=__Hf6EFzSlp1CJj68JKU6BZ0D0zIY=&sa=X&ei=wyTwTKzfIIHssgbXxOT3Cg&ved=0CCgQ9QEwAg http://hyperphysics.phy-astr.gsu.edu/hbase/biology/nervecell.html hope this helps
Answers:They aren't. In the lungs, capillaries are closely intertwined with the alveoli, passing close enough that oxygen can diffuse through the thin tissue and into the blood, where it is picked up by hemoglobin (and likewise, CO2 can cross out of the blood and be expelled). The blue diagrams in textbooks is just to illustrate that the blood is deoxygenated until it passes through the lungs. In real life, the lungs are a grayish color, while the blood itself is either bright red (oxygenated) or dark maroon (deoxygenated). At no point is the blood actually blue (it's just an optical effect combined with the natural color of blood vessels that makes the veins in your arm look blue).