09 NOV 2015 by ideonexus
Physiological Decline in the Body When You Stop Exercising
...regular endurance exercise leads to four major consequences:
Increased ability of the heart to eject blood
increased ability of the blood vessels to send blood to where blood is needed
Increased number of capillaries (the vessels that deliver oxygen and ‘food’ to the muscles)
increased size and the number of mitochondria (the “power plants” of the cells).
All these changes lead to the more efficient use of oxygen, as well as nutrients.
[...]
Pino considers a person who can run... 1 
notes
notes22 NOV 2013 by ideonexus
Stress is Healthy
Your heart might be pounding, you might be breathing faster, maybe breaking out into a sweat. And normally, we interpret these physical changes as anxiety or signs that we aren't coping very well with the pressure.
But what if you viewed them instead as signs that your body was energized, was preparing you to meet this challenge? Now that is exactly what participants were told in a study conducted at Harvard University. Before they went through the social stress test, they were taught to ret...
2 At least it can be, if we don't think of it as being detrimental. If we don't stress about stress, but rather think of it as healthy reaction and seek social connections as a coping mechanism for it, then stress is good for us.
Additional Note: Could this be why parents have longer lifespans? The oxytocin response tempers the detrimental effects of stress, leaving only the beneficial?
16 SEP 2011 by ideonexus
Ontogeny Recapitulates Phylogeny
Now, we’re not absolutely sure why some species retain much of their
evolutionary history during development. The “adding new stuff onto
old” principle is just a hypothesis—an explanation for the facts of embryology.
It’s hard to prove that it was easier for a developmental program
to evolve one way rather than another. But the facts of embryology
remain, and make sense only in light of evolution. All vertebrates begin
development looking like embryonic fish because we all descended... 1 notes
notesEmbryos go through the stages of the evolution of their ancestors as they develop.
19 MAY 2011 by ideonexus
We Recapitulate Evolution in Nine Months
Evolution sceptic: Professor Haldane, even given the billions of years that you say were
available for evolution, I simply cannot believe it is possible to go from a single cell to a
complicated human body, with its trillions of cells organized into bones and muscles and nerves, a
heart that pumps without ceasing for decades, miles and miles of blood vessels and kidney tubules,
and a brain capable of thinking and talking and feeling.
JBS: But madam, you did it yourself. And it only took you ...Folksonomies: evolution fetal development
Folksonomies: evolution fetal development
...to build a complete human being.
