Tuesday, October 22, 2019

Cell Replacement, 3

Cell Replacement, 3

Following are estimated averages for cell replacement in the human body.
Stomach - new every 2-9 days
Lungs - every 2-3 weeks
Colon - every 2-3 days
Skin - in 14 days or less
Red blood cells - every 4 months
Bones – every 10 years
Heart – ongoing
Blood Platelets - every 10 years
Liver - every five months
Joints and cartilage cells - constantly renewing

Because of this, changing to a healthier habit today can have a positive impact on cell replacement in sometimes days.

Monday, October 21, 2019

Cell Replacement, 3

This is actually good news because it means that if you create a healthier life style, your cells can becoe healthier, too.

·        Stomach - new every 2-9 days
·        Lungs - every 2-3 weeks.
·        Colon - every 2-3 days.
·        Skin - in as little as 14 days.
·        Red blood cells - every 4 months.
·        Bones – every 10 years
·        Heart - ongoing
·        Blood Platelets - every 10 years
·        Liver - every five  months.
·        Joints and cartilage cells - constantly renewing.


Cell Replacement, 2

Current wisdom is that neurons are not replaced in the adult human brain with the exception of the hippocampus, the brain’s “search engine,” so to speak. The birth of new neurons has been confirmed in the hippocampus in the adult brain and may continue until the 5th decade of life. The hippocampus is also linked with the creation of new episodic memories.

According to Margaret Reece, PhD, the formation of episodic memory is very complicated and may over-write older memories. Often 
new episodic memories incorporate parts of old memories. For example, if you revisit your old school for a reunion, memory of the reunion will incorporate earlier events from the past when you attended classes at the school.  

Friday, October 18, 2019

Cell Replacement

Is it really true that body organs are replaced regularly?

Most cells in the body are replaced regularly so eventually a body organ, such as the heart, likely has ever cell replaced over time. This is become some die due to age or wear and tear; some reach the end of their life cycle. There are many different estimates, but here are a few:

Taste buds every 10-14 days
New bones every 10 years
New heart every 20 years

Margaret Reese, PhD, estimates that only a few groups of cells in a few body parts last most of your lifetime. They include:
neurons in the cerebral cortex, the inner lens cells of the eye, and muscle cells of the heart. More tomorrow.

Thursday, October 17, 2019

Resting Pupil Size & intelligence, 2

After analyzing data related to three studies, researchers consistently found that baseline pupil size is, in fact, related to cognitive ability. They concluded that the relationship could not be explained by differences in mental effort. According to the study abstract, the effect of working memory capacity and fluid intelligence on pupil size persisted even after 23 sessions and after considering the effect of familiarity versus novelty with the environment. They also considered their findings in the context of the underlying neural mechanisms involved. The researchers took into account potential confounding variables such as: age, ethnicity, and drug substances. Bottom line: fluid intelligence, more so than working memory capacity, is related to baseline pupil size. My brain’s opinion? Bravo to your kid for not only listening but also being willing to share what he heard. Hopefully, the response he received does not slam the door on that type of future parent-child communication.

Wednesday, October 16, 2019

Resting Pupil Sign & Intelligence

Okay, this is ridiculous! My kid just came home and said his teacher said there was a correlation between resting pupil size problem-solving intelligence. I told him that was a bunch of crap and not to believe everything he hears. What are teachers teaching these days?”

Thank you for this question. My guess would be that the teacher was passing along recent researched conclusions. Before you are too hard on your kid for being willing to share new information with you, it might help to remember the comment by Wayne Walter Dyer, EdD: The highest form of ignorance is to reject something you know nothing about. There are studies related to resting eye pupil size in relation to fluid intelligence or the ability to solve problems, apply logic, and identify patterns. This in contrast with crystallized intelligence that involves using skills, knowledge. and experience. Three researchers, in a series of three studies, systematically investigated whether pupil size during a passive baseline was associated with individual differences in working memory capacity and fluid intelligence. More tomorrow.