which don't belong: skin, neural crest cells, muscle cells, neural tube?
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Skin, neural crest cells, and the neural tube are all derived from ectoderm in the embryo.\n\nMuscle cells are derived from mesoderm.
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i dont know all but heres some of them. temple, side of neck, throat, groin, front of knee, liver, back of neck, solar plexus, 3 figers below belly button, armpit, bridge of nose, collar bone, back of the head, below the ear (right next to mandible), eyes, salivary glands (beside adams apple). mmm cant remember anything else right now.
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Although differentiated cells have the entire genome of the organism (yes, there are exceptions, but don't worry about that now), many parts of it are inactived, and this inactivation is hard to undo. Thus, a muscle cell has the genes for a neuron, but it can't use them, and we can't figure out how to undo this programing.\n\nAs for HIV, it is a virus, and it just uses our genes for lipid synthesis.
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Hello,\n\n-The epithelial tissue or epithelium in dermatology is a tissue composed of a layer of cells. In humans, it is one of four primary body tissues. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies. The outermost layer of our skin is composed of dead stratified squamous epithelial cells, as are the mucous membranes lining the inside of mouths and body cavities. Other epithelial cells line the insides of the lungs, the gastrointestinal tract, the reproductive and urinary tracts, and make up the exocrine and endocrine glands.\n\nFunctions of epithelial cells include secretion, absorption, protection, transcellular transport, sensation detection, and selective permeability. Endothelium (the inner lining of blood vessels) is a specialized form of epithelium.\n\n\n-Connective tissue: is one of the four types of tissue in traditional classifications (the others being epithelial, muscle, and nervous tissue.) It is largely a category of exclusion rather than one with a precise definition, but all or most tissues in this category are similarly:\nInvolved in structure and support. \nDerived from mesoderm (there are exceptions). \nCharacterized largely by the traits of non-living tissue. \nBlood, cartilage, and bone are usually considered connective tissue, but because they differ so substantially from the other tissues in this class, the phrase "connective tissue proper" is commonly used to exclude those three. There is also variation in the classification of embryonic connective tissues; on this page they will be treated as a third and separate category. Also, labrums, facia, tendons, & ligaments are connective tissues.\n\n\nMuscular tissue: provides for all body movement. Contracting  muscles  cause  body  parts  to  move.  The three types of muscle tissue are skeletal, smooth, and cardiac. Skeletal Muscle  Tissue Skeletal  (voluntary)  muscle  fiber  is  striated,  or striped, and is under the control of the individual's will (fig. 1-9). For this reason, it is often called “voluntary” muscle   tissue.   Skeletal   muscle   tissues   are   usually attached to bones. When muscle fibers are stimulated by an action of a nerve fiber, the fibers contract and relax.  This  interaction  between  muscle  and  nervous fibers produces movement\n\nSmooth Muscle Tissue These  muscle  fibers  are  smooth,  or  nonstriated, and are not under the control of the individual's will . For this reason, this type of muscle tissue is called “involuntary.” Smooth muscle tissue is found in the   walls   of   hollow   organs,   such   as   the   stomach, intestines, blood vessels, and urinary bladder. Smooth muscle  tissues  are  responsible  for  the  movement  of food through the digestive system, constricting blood vessels, and emptying the bladder. \n\nGeneral \nAll living cells have the ability to react to stimuli. Nervous tissue is specialised to react to stimuli and to conduct impulses to various organs in the body which bring about a response to the stimulus. Nerve tissue (as in the brain, spinal cord and peripheral nerves that branch throughout the body) are all made up of specialised nerve cells called neurons. Neurons are easily stimulated and transmit impulses very rapidly. A nerve is made up of many nerve cell fibres (neurons) bound together by connective tissue. A sheath of dense connective tissue, the epineurium surrounds the nerve. This sheath penetrates the nerve to form the perineurium which surrounds bundles of nerve fibres. blood vessels of various sizes can be seen in the epineurium. The endoneurium, which consists of a thin layer of loose connective tissue, surrounds the individual nerve fibres. \n\nAlthough the system forms a unit it can be divided into the following parts: the central nervous system (CNS) which consists of the brain and spinal cord, the nervous system consists of the nerves outside the CNS which connect the brain and spinal cord to the organs and muscl
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I'm not quite sure what you are asking, but I think the answer you want is that each ganglion contains the cell bodies of the sensory neurones.\nUnipolar motor neurones have their cell bodies within the spinal cord.
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mouth\nesophagus\nstomach\nliver\ngall bladder\nintestines - small and large\nanus\n\nLink below has cool diagrams
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Simple: Our skin has sensory nerves =)
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muscle tissue cells- smooth (ability to contract) and cardiac(heart)\nepithelial tissue cells- forms the skin and organs
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hey the are not nephrons they are neurons . neurons are a part of the kidney
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The connective tissue of the penis skin contains more melanocytes than the other skin regions of the  body. Melanocytes is a very specialized cells which contains melanin pigment in their cytoplasm. Melanin pigment is synthesized from tyrosine amino acid.
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Replicate everyday: epithelial cells (skin, mucosa), bone marrow progenitor cells, lymphocytes (some of them)\nDo not replicate: neurons, skeletal muscle cells, neutrophilic granulocytes, any terminally differentiated cell
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The Epidermis\n\nThe epidermis is the outermost layer of the skin, and protects the body from the environment. The thickness of the epidermis varies in different types of skin; it is only .05 mm thick on the eyelids, and is 1.5 mm thick on the palms and the soles of the feet. The epidermis contains the melanocytes (the cells in which melanoma develops), the Langerhans' cells (involved in the immune system in the skin), Merkel cells and sensory nerves. The epidermis layer itself is made up of five sublayers that work together to continually rebuild the surface of the skin: \n\nThe Basal Cell Layer\nThe basal layer is the innermost layer of the epidermis, and contains small round cells called basal cells. The basal cells continually divide, and new cells constantly push older ones up toward the surface of the skin, where they are eventually shed. The basal cell layer is also known as the stratum germinativum due to the fact that it is constantly germinating (producing) new cells.\n\nThe basal cell layer contains cells called melanocytes. Melanocytes produce the skin coloring or pigment known as melanin, which gives skin its tan or brown color and helps protect the deeper layers of the skin from the harmful effects of the sun. Sun exposure causes melanocytes to increase production of melanin in order to protect the skin from damaging ultraviolet rays, producing a suntan. Patches of melanin in the skin cause birthmarks, freckles and age spots. Melanoma develops when melanocytes undergo malignant transformation.\n\nMerkel cells, which are tactile cells of neuroectodermal origin, are also located in the basal layer of the epidermis. \n\nThe Squamous Cell Layer \nThe squamous cell layer is located above the basal layer, and is also known as the stratum spinosum or “spiny layer” due to the fact that the cells are held together with spiny projections. Within this layer are the basal cells that have been pushed upward, however these maturing cells are now called squamous cells, or keratinocytes. Keratinocytes produce keratin, a tough, protective protein that makes up the majority of the structure of the skin, hair, and nails. \n\nThe squamous cell layer is the thickest layer of the epidermis, and is involved in the transfer of certain substances in and out of the body. The squamous cell layer also contains cells called Langerhans cells. These cells attach themselves to antigens that invade damaged skin and alert the immune system to their presence. \n\nThe Stratum Granulosum & the Stratum Lucidum \nThe keratinocytes from the squamous layer are then pushed up through two thin epidermal layers called the stratum granulosum and the stratum lucidum. As these cells move further towards the surface of the skin, they get bigger and flatter and adhere together, and then eventually become dehydrated and die. This process results in the cells fusing together into layers of tough, durable material, which continue to migrate up to the surface of the skin.\n\nThe Stratum Corneum\nThe stratum corneum is the outermost layer of the epidermis, and is made up of 10 to 30 thin layers of continually shedding, dead keratinocytes. The stratum corneum is also known as the “horny layer,” because its cells are toughened like an animal’s horn. As the outermost cells age and wear down, they are replaced by new layers of strong, long-wearing cells. The stratum corneum is sloughed off continually as new cells take its place, but this shedding process slows down with age. Complete cell turnover occurs every 28 to 30 days in young adults, while the same process takes 45 to 50 days in elderly adults.\n\nThe Dermis\nThe dermis is located beneath the epidermis and is the thickest of the three layers of the skin (1.5 to 4 mm thick), making up approximately 90 percent of the thickness of the skin. The main functions of the dermis are to regulate temperature and to supply the epidermis with nutrient-saturated blood. Much of the body’s water supply is stored
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There are three:\nepidermis\ndermis\nsubcutaneous fat
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The human body is made up of four different tissues:\n1- epithelial: protective and covering\n            secretory\n2- connective: proper\n            bone\n            cartilage\n            blood and blood forming tissue\n3-muscular: skeletal(striated, voluntary)\n          visceral(smooth, involuntary)\n          cardiac(striated, involuntary)\n4-nervous: neurons transmitting the nervous impulse and neuroglia supporting, anchoring and protecting the neurons.
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forebrain\nmidbrain\nhindbrain
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Afferent (sensory) nerves originate from the dorsal (back) horn. They are classified as pseudounipolar cells and the cell body of the neuron is a bit farther from the dendrites. The dorsal root ganglion is a collection of the cell bodies for the sensory pseudounipolar cells. All sensory nerves have ganglia.
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Hint: endoderm forms most of the digestive system, as well as other important organs\nEctoderm forms the tegument and the nervous system.\nWhat do you have that's between them?