Development, growth, aging, & genetics

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created 9 months ago by sunshineb777
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1

FERTILIZATION

  • WHEN PRENATAL DEVELOPMENT BEGINS
  • OCCURS WHEN A SPERM CELL ATTACHES TO A SECONDARY OOCYTE, & THE CONTENTS OF THE SPERM HEAD ENTER THE OOCYTE CYTOPLASM & JOIN WITH THE OOCYTE PRONUCLEUS
2

ZYGOTE

  • THE PRODUCT OF FERTILIZATION IS A SINGLE, DIPLOID CELL
3

EMBRYO

  • AN ORGANISM IN THE EARLY STAGES OF GROWTH & DIFFERENTIATION, FROM FERTILIZATION TO THE BEGINNING OF THE THIRD MONTH OF PREGNANCY
4

FETUS

  • 56 DAYS AFTER FERTILIZATION TO BIRTH (THE LAST 30 WEEKS OF DEVELOPMENT)
  • DURING THIS STAGE, THE ORGAN SYSTEMS GROW & BECOME MORE MATURE, AND THE DEVELOPING HUMAN IS CALLED A FETUS
5

MORULA

  • ONCE THE DIVIDING EMBRYO CONSISTS OF 12 OR MORE CELLS, IT IS A SOLID MASS OF CELLS
6

BLASTULA

  • HOLLOW SPHERE OF CELLS, OR BLASTOMERES, PRODUCED DURING THE DEVELOPMENT OF AN EMBRYO BY REPEATED CLEAVAGE OF A FERTILIZED EGG
7

BLASTOCELE

  • FLUID FILLED CAVITY INSIDE A BLASTULA
8

CHORION

  • THE ENTIRE EMBRYONIC STRUCTURE FACING THE MATERNAL TISSUES
9

AMNION

  • THE LAYER OF CELLS SURROUNDING THE AMNIOTIC CAVITY
10

ECTODERM

  • THE OUTERMOST LAYER OF CELLS OR TISSUE OF AN EMBRYO IN EARLY DEVELOPMENT, OR THE PARTS DERIVED FROM THIS, WHICH INCLUDE THE EPIDERMIS & NERVE TISSUE
11

MESODERM

  • THE MIDDLE LAYER OF AN EMBRYO IN EARLY DEVELOPMENT
  • DIFFERENTIATES TO GIVE RISE TO A NUMBER OF TISSUES & STRUCTURES, INCLUDING BONE, MUSCLE, CONNECTIVE TISSUE, & THE MIDDLE LAYER OF THE SKIN
12

ENDODERM

  • THE INNERMOST LAYER OF CELLS OR TISSUES OF AN EMBRYO IN EARLY DEVELOPMENT, OR THE PARTS DERIVED FROM THIS, WHICH INCLUDE THE LINING OF THE GUT & ASSOCIATED STRUCTURES
13

CELL DIFFERENTIATION

  • THE PROCESS DURING WHICH YOUNG, IMMATURE (UNSPECIALIZED) CELLS TAKE ON INDIVIDUAL CHARACTERISTICS & REACH THEIR MATURE (SPECIALIZED) FORM & FUNCTION
14

PARTURITION

  • THE PROCESS BY WHICH A BABY IS BORN
  1. DILATION STAGE: BEGINS WITH THE ONSET OF REGULAR UTERINE CONTRACTIONS
  2. EXPULSION STAGE: LASTS FROM THE TIME OF MAXIMUM CERVICAL DILATION UNTIL THE FETUS EXITS THE VAGINA
  3. PLACENTAL STAGE: OCCURS AFTER THE BIRTH OF THE FETUS. THE PLACENTA IS EXPELLED FROM THE UTERUS