Page 29 - SAAT BIOLOGY PART 2

SAAT BIOLOGY MR.MOHAMED ELGAYAR MRPROF.NET

• The first trimester: fingerprints appear

• The second trimester: the mother feels the fetal

movement

• The third trimester: the accumulation of fat under the skin

• Causes of birth defect: smoking which decreases the

weight of the baby and the incomplete development, the

lack of folic acid

Results in the incomplete growth of brain ad head

• Immune System:

• Nonspecific immunity: the first of defense, including the

skin barrier and chemical barriers like tears.

• Phagocytosis: the process by which phagocytic cells

surround and internalize the foreign microorganisms

• Interferon: an antiviral protein

Specific Immunity

MRPROF.NET MR.MOHAMED ELGAYAR MRPROF.NET@GMAIL.COM