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Politics : The Exxon Free Environmental Thread -- Ignore unavailable to you. Want to Upgrade?

To: Wharf Rat who wrote (9922)

3/24/2012 11:34:04 AM

From: Wharf Rat

Respond to of 48928

Planetary physiology...closing the isthmus

human physiology..closing the foramen ovale

Foramen ovale (heart)

Foramen ovale (heart)Gray's MeSH


Sketch showing foramen ovale in a fetal heart. Red arrow shows blood from the inferior caval vein. HF: right atrium, VF: left atrium. HH og VH: right and left ventricle. The heart still has a common pulmonary vein (LV), instead of four.

Heart of human embryo of about thirty-five days, opened on right side.
subject #135 512
Foramen+Ovale

In the fetal heart, the foramen ovale (

/ f ? ' r e? m ? n o? ' v æ l i? /), also ostium secundum of Born or falx septi, allows blood to enter the left atrium from the right atrium. It is one of two fetal cardiac shunts, the other being the ductus arteriosus (which allows blood that still escapes to the right ventricle to bypass the pulmonary circulation). Another similar adaptation in the fetus is the ductus venosus. In most individuals, the foramen ovale closes at birth. It later forms the fossa ovalis.
en.wikipedia.org