0
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
What else can I help you with?
The layers of the epidermis where mitotic divisions occur are?
Mitotic divisions occur in the stratum basale layer of the epidermis, also known as the basal layer or stratum germinativum. This layer is located at the bottom of the epidermis and contains stem cells that continuously divide to produce new skin cells.
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 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 difference between the epidermis of human and invertebrates?
The epidermis of humans is typically multilayered, with specialized cells like keratinocytes that produce keratin to provide protection. In invertebrates, the epidermis is usually a single layer of cells responsible for secretion of cuticle or exoskeleton for support and protection. Additionally, human epidermis often contains melanocytes responsible for pigmentation, which is not typically present in invertebrate epidermis.
Which is more advantageous to plants-more stomata on the upper epidermis or lower epidermis?
upper epidermis for sure>>>
In what environment do many single-replacement reactions commonly occur?
Many single-replacement reactions commonly occur in aqueous solutions, such as in chemistry labs or industrial processes. These reactions involve an element or ion replacing another element in a compound and are often driven by the differences in reactivity between the elements involved.
Where does mitosis or replacement of the skin take place?
Mitosis and the replacement of skin cells primarily occur in the epidermis, the outermost layer of the skin. Specifically, this process takes place in the basal layer (stratum basale), where stem cells divide to produce new keratinocytes. As these new cells proliferate, they move upwards through the layers of the epidermis, eventually reaching the surface where they shed and are replaced regularly. This continuous cycle helps maintain the skin's integrity and barrier functions.
The layers of the epidermis where mitotic divisions occur are?
Mitotic divisions occur in the stratum basale layer of the epidermis, also known as the basal layer or stratum germinativum. This layer is located at the bottom of the epidermis and contains stem cells that continuously divide to produce new skin cells.
What are four chemical reactions that can occur?
SynthesisDecomposition Single replacement Double replacement Combustion
Why wouldn't a double replacement reaction occur?
A double replacement reaction may not occur if the possible products are insoluble or if there is no driving force for the reaction to proceed. Additionally, if the reactants do not contain the necessary ions to exchange partners, a double replacement reaction may not occur.
How does single replacement occur in the industry?
Most batteries work via a single replacement reaction.
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
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.
Why is the upper epidermis thicker than the lower epidermis?
the epidermis is thicker.
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."
How many cells rub off your epidermis while showering?
The stratum corneum (outer most layer of epidermis) is a basically a collection of dead cells. It takes 14 days for shedding and replacement of all these cells. 14 days from now everyone has a new stratum corneum.
