2007-03-13 16:05:53 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Biology
umbillicord.
2007-03-13 16:09:23 · answer #1 · answered by skcs11 7 · 0⤊ 1⤋
placenta
The placenta receives nutrients, oxygen, antibodies and hormones from the mother's blood and passes out waste. It forms a barrier, the placental barrier, which filters out some substances which could harm the fetus. Many substances are not filtered out, however, including alcohol and some chemicals associated with smoking cigarettes. Several types of viruses, such as Human Cytomegalovirus, may also cross this barrier; this often leads to various degrees of birth defects in the infant.
2007-03-13 23:11:50 · answer #2 · answered by ANITHA 3 · 0⤊ 0⤋
The placenta
http://www.sjrcc.cc.fl.us/faculty/rich/bsc2086ch28.html
http://en.wikipedia.org/wiki/Placenta
2007-03-13 23:10:33 · answer #3 · answered by Alletery 6 · 1⤊ 0⤋
placenta
http://sps.k12.ar.us/massengale/fetal_pig_dissection.htm
2007-03-13 23:09:13 · answer #4 · answered by Jennifer L 4 · 2⤊ 0⤋
placenta
2007-03-13 23:10:05 · answer #5 · answered by Anonymous · 1⤊ 0⤋
umbilical cord?
2007-03-13 23:08:24 · answer #6 · answered by Newbody 4 · 0⤊ 1⤋