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12 BIO ZOOLOGY BOOK

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Tamil Nadu 12th Class School Textbooks Online: Studyguideindia provides Class 12th Tamil Nadu Bio Chemistry (Tamil Medium) · Bio Chemistry1 (Tamil Medium) · Bio Zoology (Tamil Medium) State Wise School Text Books Download. Tamilnadu 12th New Books Free Download PDF Online resourceone.info Tamilnadu 12th Standard Books to TN HSC Samacheer Kalvi Bio-Zoology. Text book published by Government of Tamil Nadu.


12 Bio Zoology Book

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Tamil Nadu Class 12 – Bio-zoology-zoology – English Medium - Possible 5 Mark Download as PDF File .pdf), Text File .txt) or read online. tamilnadu class 12 zoology material. was provided by Th. Dobzhansky in his book titled. Genetics . 12th new syllabus text books download Click here; 12th Zoology Text Book (NEW SYLLABUS ) - English Medium; 12th Bio Botany Text Book ( NEW. TEXT-BOOKS OF ANIMAL BIOLOGY A General Zoology of the Invertebrates Vertebrate Biology botany higher secondary - first year - Text Books Online.

All organs and structures continue to develop. The placenta has taken over the functions of nutrition and waste and the production of estrogen and progesterone from the corpus luteum, which has degenerated.

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The placenta will continue functioning up through the delivery of the baby. This fetus is just entering the second trimester, when the placenta takes over more of the functions performed as the baby develops. This is the period of the most rapid growth during the pregnancy.

Organ development continues to birth and some systems, such as the nervous system and liver, continue to develop after birth. The mother will be at her most uncomfortable during this trimester. She may urinate frequently due to pressure on the bladder from the fetus. There may also be intestinal blockage and circulatory problems, especially in her legs.

Tamil Nadu cuts down on texts for botany & zoology

Clots may form in her legs due to pressure from the fetus on returning veins as they enter the abdominal cavity. There is rapid fetal growth during the third trimester. Labor and Birth Labor is the physical efforts of expulsion of the fetus and the placenta from the uterus during birth parturition.

Toward the end of the third trimester, estrogen causes receptors on the uterine wall to develop and bind the hormone oxytocin. At this time, the baby reorients, facing forward and down with the back or crown of the head engaging the cervix uterine opening. This causes the cervix to stretch and nerve impulses are sent to the hypothalamus, which signals for the release of oxytocin from the posterior pituitary.

The oxytocin causes the smooth muscle in the uterine wall to contract.

At the same time, the placenta releases prostaglandins into the uterus, increasing the contractions. A positive feedback relay occurs between the uterus, hypothalamus, and the posterior pituitary to assure an adequate supply of oxytocin.

As more smooth muscle cells are recruited, the contractions increase in intensity and force. There are three stages to labor.

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During stage one, the cervix thins and dilates. This is necessary for the baby and placenta to be expelled during birth. The cervix will eventually dilate to about 10 cm. During stage two, the baby is expelled from the uterus. The uterus contracts and the mother pushes as she compresses her abdominal muscles to aid the delivery.

The last stage is the passage of the placenta after the baby has been born and the organ has completely disengaged from the uterine wall. If labor should stop before stage two is reached, synthetic oxytocin, known as Pitocin, can be administered to restart and maintain labor. An alternative to labor and delivery is the surgical delivery of the baby through a procedure called a Caesarian section.

This is major abdominal surgery and can lead to post-surgical complications for the mother, but in some cases it may be the only way to safely deliver the baby. When the baby begins suckling at the breast, signals are sent to the hypothalamus causing the release of prolactin from the anterior pituitary.

Particularly for history and topography.

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