labor reproduction

Instructor discusses scheduling and logistics for the remainder of the semester.
- Mention of summer class for the instructor and future classes transitioning to a new learning management system, Canvas, instead of Blackboard.
- Reminder for students to download and save course materials before Blackboard access ends.

The instructor shares personal challenges with unreliable internet and discusses using alternative internet sources for class purposes.
Emphasis on student engagement and open communication, mentioning previous teaching experiences involving remote learning.

Overview of the remaining weeks in the semester.
  - Current Topic: Chapter 28 - Focus: Pregnancy, Labor, Delivery.
  - Next Class: Discussion on labor and delivery, contraception in dogs.
  - Upcoming Exam: Reminder about the lab exam scheduled for one week from this class session.

Description of lab exam structure: 25 stations, 3 questions at each station.
Content areas for review include:
  - Directional Anatomy: Quadrants of the abdomen, visceral and parietal membranes, directional terminology.
  - Microscopy: Parts of the microscope, including:
    - Field of View
    - Working Distance
    - Parfocal Characteristics
    - Resolution
    - Total Magnification
    - Wet Mount Preparation
    - Iris Diaphragm Function
  - Cell Model: Identification of organelles and their functions.
  - Diffusion and Osmosis: Experiment involving eggs in various solutions (hypertonic, hypotonic, isotonic) and understanding results.
  - Tissues: Functions of tissue types covered in a previous handout, microscope use, and cells used in the lab.
  - Skeletal System: Names and identification of major bones and axial/appendicular skeleton anatomy.
  - Renal System: Structure and function of kidneys and nephrons.
  - Reproductive System: Models of male and female systems.

Students are encouraged to review:
  - Lab exercises and relevant e-books/manuals for comprehensive understanding.
  - Membrane functions and directional terms thoroughly.
  - Ensuring familiarity with anatomical models and structures.

Explanation of transition from Blackboard to Canvas for the next semester, with insight into expected changes and user experiences.
Reference to prior experience with distance learning technology and the importance of adaptation for teaching methods.

Transition to detailed content on pregnancy during the current lecture.
Definitions: Conceptus refers to what is carried during pregnancy, encompassing zygote, embryo, and fetus at different developmental stages.
Gestation Period: Differences in understanding gestation based on the last menstrual period (LMP).
- Standard calculation: 40 weeks (282 days) from LMP.
Variability in pregnancy term: Normal range from 38 to 42 weeks is discussed.

Classification of embryonic development:
  - Zygote: Fertilized egg, exists for a short time post-fertilization.
  - Embryo: From zygote formation until approximately 8 weeks gestation, when it becomes a fetus.
  - Fetus: Begins at week 9 after development of major organ systems.

The fertilization process and the activation of the oocyte are outlined, including:
  - A viable oocyte exists about one day post-ovulation, with sperm viability extending for 1-2 days post-ejaculation.
  - Optimal timing for conception: sex attempted around time of ovulation.
  - Role of ovulation predictors in planning conception for couples.
Preventing Polyspermy: Mechanism by which only one sperm can fertilize the egg, including changes in the egg’s membrane once a sperm enters.

Describes the stages after fertilization:
  - Cleavage: Division of the zygote into a solid ball of cells, forming a morula (name inspired by a mulberry).
  - Blastocyst Formation: Transition from morula to a hollow structure ready for implantation into the endometrial lining.
  - Importance of implantation and potential risks to zygote survival due to chromosomal abnormalities.

Explanation of pluripotent stem cells: These cells can differentiate into any cell type.
The relevance of stem cells in medical treatments and the ethical considerations surrounding their use in research.
- Parents may save umbilical cord blood for potential stem cell treatment for children.
Discussion of how stem cells can potentially cure diseases like cancer, but ethical concerns limit research.

Human Chorionic Gonadotropin (HCG): Key hormone in early pregnancy affecting ovarian function and pregnancy symptoms.
- Effects of HCG include maintaining corpus luteum production of estrogen and progesterone, which prevent menstrual cycle processes.
- HCG testing used in pregnancy tests is traditionally measured through urine concentration.

Major structures surrounding the developing embryo, including:
- Amniotic Fluid and Membranes: Protective environment that aids in fetal development.
- Formation of the placenta: Critical for nutrient and waste exchange between mother and fetus.

Basics of gastrulation and differentiation into three germ layers:
  - Ectoderm: Forms nervous system and skin.
  - Mesoderm: Develops musculature and other organ systems.
  - Endoderm: Involved in forming digestive and respiratory systems.

Overview of teratogens affecting fetal development, including teratogenic effects of alcohol leading to fetal alcohol syndrome.
Discussion of common pregnancy complications:
  - Preeclampsia and Eclampsia: Risks and signs/significant symptoms to monitor.
  - Gestational Diabetes: Indications and testing methods.
  - Ectopic Pregnancies: Life-threatening conditions if undiagnosed.
  - Placenta Previa: C-section considerations if placenta covers the cervix.

Description of the hormonal triggers that begin the labor process:
- Cortisol from the fetus begins the chain reaction leading to contractions.
- Role of oxytocin in the birthing process and cervix dilation.

Instructor concludes lecture and organizes for further discussion next class session, encouraging students' preparation for upcoming exams.