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you have a completely new body every seven years but your brain cells never are replaced.
All cells are not regenerated or renewed daily; it depends on which cells of the body you speak of.
Actually the term "brain cells" includes neurons and there has been recent research proving that neurogenesis does, in fact, occur to replace dead neurons. I've personally read articles on this type of research having been done initially with rats, and even more recently with patients with Alzheimer's. I subscribe to the Dana Foundation's free newsletter and it has very interesting articles on the brain. I would highly suggest it. Here is an article on their website about neurogenesis research.
http://www.Dana.org/news/publications/detail.aspx?id=6316
I've heard of the 7-year cycle for cell regeneration, but I've not found any research sites connected with that. I'd be interested in seeing a link to the source for the first person's answer. (I was Googling this same question myself, which is how I found this site in the first place.) :)
---Debi62
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoreplacement of the epidermis is a continuous process, as cells divide at the basal layer, new skin is formed from underneath as the old skin on the top is sloughed off. a full cycle, from cell division to cells being sloughed off the surface is approx 1 month
Wiki User
∙ 10y agoaverage of 2-4 weeks. but it really depends of what type of epidermal cell.
Wiki User
∙ 12y agoit takes about 6 weeks for the epidermis to renew itself
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The layers of the epidermis where mitotic divisions occur are?
stratum basale, (germnativum) and stratum spinosum
Where does photosynthesis usually occur in epidermis?
The epidermis of most plants is made of transparent cells that allow light into the mesophyll cells below them, which contain chloroplasts and are the site of photosynthesis. Additionally, the epidermis contains stomata, which are pores that allow for the exchange of gases with the atmosphere. This lets the plants take in carbon dioxide and release oxygen, as well as allowing for transpiration (evaporation), which ultimately helps to move water into leaves. Waters is also needed for photosynthesis.
What is the outermost skin layer called?
The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing."
What layer of the epidermis is avascular?
the epidermis is avascular
The epidermis differs from the inner lining of the esophagus in that the epidermis?
epidermis= Keratinized Lining of the esophagus= nonkeratinized
The layers of the epidermis where mitotic divisions occur are?
stratum basale, (germnativum) and stratum spinosum
In what environment do many single-replacement reactions commonly occur?
Many single-replacement reactions occur in an aqueous solution.
What are four chemical reactions that can occur?
SynthesisDecomposition Single replacement Double replacement Combustion
How does single replacement occur in the industry?
Most batteries work via a single replacement reaction.
Where does photosynthesis usually occur in epidermis?
The epidermis of most plants is made of transparent cells that allow light into the mesophyll cells below them, which contain chloroplasts and are the site of photosynthesis. Additionally, the epidermis contains stomata, which are pores that allow for the exchange of gases with the atmosphere. This lets the plants take in carbon dioxide and release oxygen, as well as allowing for transpiration (evaporation), which ultimately helps to move water into leaves. Waters is also needed for photosynthesis.
What Describes a double replacement reaction?
In a double replacement reaction a change of bonds between reactants occur.
How many layer thick is the epidermis?
Answer: the epidermis of a leaf includes: upper epidermis and lower epidermis but if you are referring to the epidermis of an onion: it is only one layer
What is the outermost skin layer called?
The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing." The outermost layer of skin is the epidermis. As in the joke "Your epidermis is showing."
Where does keratinization occur?
the addition of keratin to the stratified squamous epithelial cells in the epidermis. Begins in the stratum spinosum and continues into the stratum granulosum.
Is the epidermis dead?
Dead Epidermis refers to dead upper skin layers in humans and animals. The skin has two layers, the Epidermis (which is on the very surface) and the much thicker Dermis, which lies below and forms the main body of skin. Every so often, parts of the epidermis die and flake off, to be replaced by a new one that grows to take it's place. This is to keep the skin clean, and get rid of harmful bacteria that get trapped in the Epidermis.
Will a single replacement reaction occur for aluminum and hydrochloric acid?
yes
Why is the upper epidermis thicker than the lower epidermis?
the epidermis is thicker.
