Pregnency & Placenta || Reproduction in lower & Higher Animals || lecture 9 || Class 12 |MHTCET NEET скачать в хорошем качестве

Pregnency & Placenta || Reproduction in lower & Higher Animals || lecture 9 || Class 12 |MHTCET NEET

Pregnency & Placenta || Reproduction in lower & Higher Animals || lecture 9 || Class 12 |MHTCET NEET During pregnancy, the human body undergoes a remarkable transformation to support a developing fetus. Central to this process is the placenta, a temporary organ that acts as a life-support system, bridging the gap between mother and baby. What is the Placenta? The placenta is a pancake-shaped organ that develops in the uterus shortly after a fertilized egg implants. It is unique because it is composed of tissues from both the mother and the fetus, though it carries the same genetic makeup as the baby. It is connected to the fetus via the umbilical cord. Functions of the Placenta Often described as a "multitasking" organ, the placenta performs the work of several organ systems that the fetus hasn't fully developed yet: Respiratory & Nutritive Exchange: It acts as the baby’s "lungs" and "digestive tract." It transfers oxygen and nutrients (like glucose and amino acids) from the mother’s blood into the baby’s bloodstream. Waste Removal: It filters out carbon dioxide and other waste products (like urea) from the baby’s blood, passing them back to the mother to be excreted. Hormone Production: The placenta produces essential hormones like hCG, estrogen, and progesterone. these maintain the pregnancy, prepare the mother’s body for breastfeeding, and signal the uterus to grow. Immune Protection: Toward the end of pregnancy, the placenta passes maternal antibodies to the fetus, providing the baby with temporary immunity against certain infections after birth. The Placental Barrier One of the most fascinating aspects of the placenta is the placental barrier. While the mother’s and baby’s blood vessels are in very close contact to allow for the exchange of gases and nutrients, their blood never actually mixes. This barrier helps protect the fetus from some bacteria and the mother's own immune system, which might otherwise view the fetus as a foreign object. Delivery and "Afterbirth" Once the baby is born, the placenta's job is complete. In the final stage of labor, the placenta detaches from the uterine wall and is delivered through the birth canal. This is why it is commonly referred to as the afterbirth. Instagram   / bhushan_gayakwad   #neet #class12th #bhushangayakwad #biology #biologycurriculum #12thmathobjectiveforboardexam2026 #neet #biologyimportanttopics #biologysyllabus #aiims #cbse12thbiology12thscience #12th #students #mhtcet #mhtcet2026 #cet2026 if u like this video hit like button subscribe for more interesting videos. share to spread the knowledge. Join this channel to get access to perks:    / @bhushangayakwadtutorial