Explain the birth in human biology, Biology

Assignment Help:

Explain the Birth in human biology?

In humans, birth of the infant occurs about 270 days after conception.

The period during which the uterus contracts to expel the newborn and the placenta is called labor. Sometimes, the first sign of labor is the rupture of the amnion and loss of amniotic fluid. The fluid escapes through the vagina. This is commonly referred to as when someone's "water breaks."

The beginning of labor is triggered by several stimuli. Toward the end of the third trimester of pregnancy, estrogen is produced in larger amounts, stimulating contractions of uterine muscle. The pituitary glands of both mother and fetus secrete oxytocin, that also stimulates uterine contraction. During this stage of labor, uterine contractions pull the cervix open (dilation) until it is large enough to allow the baby to pass through.

During the second stage, the baby's head moves into the vagina and is visible from the outside. As soon as the baby is out of the birth canal, it can breathe and can be independent of the mother's circulation, which is when the umbilical cord can be clamped and cut. The placenta and fetal membranes are expelled a few minutes to an hour after birth.

 


Related Discussions:- Explain the birth in human biology

Explain about manual and automatic toothbrushes, Manual and Automatic Tooth...

Manual and Automatic Toothbrushes Brushing is imperative and soft or medium toothbrushes are recommended. Small heads are useful because they allow better access. Automatic too

Explain the features of alternaria, Explain the Features of Alternaria? ...

Explain the Features of Alternaria? 1. Alternaria colony is wooly and compact. Underside is very dark coloured. Colony colour is grayish green or black with gray edges rapidly

Human diseases caused by bacteria, Q. What are some human diseases caused b...

Q. What are some human diseases caused by bacteria and what are their respective modes of transmission? The major human bacterial infections transmitted by respiratory secretio

What is the prothallus of pteridophytes, Q. What is the prothallus of pteri...

Q. What is the prothallus of pteridophytes? The gametophyte develops by mitosis from a spore and Prothallus is the pteridophyte gametophyte (the haploid individual that forms g

What is the difference among white and red blood cells, What is the differe...

What is the difference among white and red blood cells? What are leukocytes? Red blood cells are erythrocytes and white blood cells are the leukocytes. Leukocytes are cells

How does the heart impel the blood, How does the heart impel the blood? ...

How does the heart impel the blood? The heart is a muscular organ that having chambers (right atrium and right ventricle and left atrium and right ventricle) by which blood pas

What is cost effective analysis, What is Cost Effective Analysis? Cost ...

What is Cost Effective Analysis? Cost effective analysis: Cost effective analysis provides for the choice of least expensive strategy at the least cost. Here the outcome is mea

Explain echinocandins, Explain Echinocandins It inhibit synthesis of β ...

Explain Echinocandins It inhibit synthesis of β (1,3)-D-glucan, an essential component of the fungal cell wall. The potential for adverse effects in humans is low because of th

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd