ANS 123 Lec
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What do we need for development to happen???
- -changes in physiological needs as animals mature.
- -physical consequence of growing bigger--> "pure physics: (eye can only be so big).
deposit of material between cells
increase in cell #
increase in cell size
from a lower to higher form of complexity
increase in size (height, wt, body ash, body protein, lean tissue wt)
SUMMARY (Lecture 1)
- a growing living thing has to alter its form and function.
- Growth cannot happen without development.
- development continues throughout life until death.
Prenatal Development (importance)
- future health
- little flexibility
- important for the later health of animal
Prenatal Development continued
- 3 parts
- Preimplantation phase-from fertilization to implantation/attachment
- Embryonic phase-where all major organ systems are established
- Fetal phase-growth and refinement of organ systems
Influence of PRENATAL DEV. post-natally
- baby survival is proportional to birth weight
- depending on what happened during prenatal life
- -->it affects the kind of disease you get as an adult. (ex: heart disease, diabetes)
- it's similar to other species
- it's irreversible
- increasing complexity
from conception until development of organs
from then until birth
SUMMARY (Lecture 2)
- Prenatal development is an important period of an organism life (time, future performance, future health, little flexibility)
- Development is progressive, continuous and results in increasing complexity
- Similar between species
- All cells have the necessary information to direct the formation of a whole individual (nuclear totipotency)
- changes that are inheritable from cell to cell.
- can last for multiple generations
- changes remain through cell division
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