Tractate 1.2 Significance of the Appearance of Neurons and Cardiomyocytes

Previously, we discussed the advantages and disadvantages of asexual and sexual reproduction. We found the primary evolutionary advantage to sexual reproduction, by a halving of the chromosome number in the gametes, was genetic recombination so to form somatic cells behaving in new and unique ways. However, this selective advantage did not allow evolution to move beyond simple multicellular animals, such as sponges.

What was needed to generate more organized bodies was a nervous and circulatory system allowing [1] sensory information and motor commands to be transmitted over long distances via nerves, [2] a heart to pump nutrients to and remove wastes from organized tissues, and [3] an extended hormonal system.

As I am extremely busy this week, I am going to ask the serious seekers to read two good articles.  Consider it as an occasional exercise of good faith!

[1] Evolution of the Nervous System and Brain by Gerhard Roth and Ursula Dicke at

Article Evolution Nervous System

[2]  Evolution of Circulatory System

Article Evolution Circulatory System

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s