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

Ammonia assimilation, Ammonia Assimilation - Inorganic Nitrogen and Sulphur...

Ammonia Assimilation - Inorganic Nitrogen and Sulphur Metabolism Nitrogen (N 2 ) gas and NO 3 are the most common available forms of inorganic nitrogen. Both are enzymaticall

Tetanus, Tetanus This is an infectious, non-febrile disease of animals...

Tetanus This is an infectious, non-febrile disease of animals and man, and is characterised by spasmodic tetany and hyperaesthesia. The causative agent is Clostridium tetani,

Cells, What surrounds a plant cell

What surrounds a plant cell

Define and compare bone modeling and remodeling, Define and compare bone mo...

Define and compare bone modeling and remodeling Bone modeling is a surface-specific activity (apposition or resorption) that produces a net change in the sie and/or shape of a

Explain about bone lining cells, Explain about Bone lining cells Bone ...

Explain about Bone lining cells Bone lining cells are basically inactive osteoblasts (in terms of making bone) that line bone surfaces. Osteocytes are osteoblasts that have be

Define fats required for underweight - nutritional care, Define Fats requir...

Define Fats required for underweight - nutritional care? Fats: We know that fats are concentrated source of energy (lg = 9 Kcals). Fats are capable of increasing the energy val

What is hazard identification, What is Hazard Identification Hazard  I...

What is Hazard Identification Hazard  Identification :  The  identification  of  known  or potential  health effects associated with  a  certain  agent.

Explain type 2 diabetes mellitus, Q. Explain Type 2 Diabetes Mellitus? ...

Q. Explain Type 2 Diabetes Mellitus? It is the most common form of diabetes accounting for 90-95% of patients with diabetes. Type 2 Diabetes Mellitus was previously called as N

What do you understand by taxonomy, Q. What do you understand by taxonomy? ...

Q. What do you understand by taxonomy? Taxonomy is dependent on many sciences and they in turn are equally dependent on it. The activities of a taxonomist are basic to all othe

How old is the earth, How old is the earth? It is believed that the ear...

How old is the earth? It is believed that the earth is about 4.5 billion years old.

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