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Human reproduction

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  3. Human Reproductive Biology | NHBS Academic & Professional Books

The method could be used for selecting sperm for assisted reproduction techniques, such as intracytoplasmic sperm injection. Research 28 June open. Research 26 June Editorial 24 June Comments and Opinion 12 June Research Highlights 12 April News and Views 18 March Jae-Wook Jeong and colleagues report that histone deacetylase 3 HDAC3 is downregulated in the endometrium of women with endometriosis.

In addition, they show that the loss of HDAC3 is associated with aberrant hormonal signalling and increased fibrosis in the endometrium and impaired endometrial receptivity. Research Highlights 08 March Comments and Opinion 11 February Advanced search. Skip to main content. Search My Account Login.

Related Subjects Menopause Reproductive disorders. Latest Research and Reviews Research 05 July open Adverse perinatal outcomes for obese women are influenced by the presence of comorbid diabetes and hypertensive disorders Evelyne M.

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Cignacco Scientific Reports 9 , Brown , Jennifer L. Sones , Cynthia N. Growth of public and underarm hair e. General growth spurt in height. FSH-follicle stimulating hormone. Days of menstrual cycle. Stimulates egg production within Graafian follicles. Sometimes used in fertility treatment to stimulate egg production. Graafian follicles secrete oestrogen. Development of endometrium. Inhibits FSH so no new eggs develop. Stimulates the release of LH luteinising hormone. LH- leuteinising hormone. Day 14 of menstrual cycle. Causes Graafian follicle to develop into the corpus luteum. The corpus luteum makes progesterone.

Inhibits LH so no new ovulations occur. Prevents contractions of the uterus. Female infertility is the inability to conceive either by fertilisation failure or implantation failure. Egg cell formation or ovulation may not occur due to a hormone imbalance. The egg cell may not be able pass to the uterus due to blockage of the Fallopian tubes.

Treatment with hormones may be successful. In-vitro fertilisation and implantation is often used to treat female infertility. Fibroids are benign tumours of the uterus.

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They are slow growing and range in size. Small fibroids produce no symptoms while large ones can cause heavy and prolonged menstrual bleeding. They can also cause pain, miscarriage, or infertility. Some science shows that they may be caused as an abnormal response to oestrogen. Large fibroids are removed by surgery. In severe cases where there are many large fibroids the uterus may have to be removed. This is called a hysterectomy.

Copulation is also called coitus or sexual intercourse. During this process the penis moves into the vagina in order to deposit semen which contains sperm cells. The depositing of the semen is called insemination. After insemination the sperm will move up the Fallopian tubes. If ovulation has occurred and an egg is present the egg will release a chemical that attracts the sperm.

This is called chemotaxix. The sperm that reaches the egg will use an enzyme in its acrosomes to make an opening in the membrane of the egg. Once one sperm enters the egg only the head enters the egg forms a membrane that prevents other sperm from entering. The nucleus of the egg fuses with the nucleus of the egg. A diploid zygote forms. Fertilisation may take place during days of the menstrual cycle. About days after fertilisation the fertilised egg becomes embedded into the lining of the uterus.

The zygote has now become an embryo. A membrane called the amnion develops around the ebbryo. This membrane will secrete amnion fluid which surrounds and protects the embryo. After implantation the embryo forms another membrane called the chorion. This surrounds the embryo. Projections of the chorion called villi join with blood vessels in the endometrium to form the placenta.

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The placenta become fully functional in about 3 months. The umbilical cord connects the embryo at the navel with the placenta. It hinders the entry of pathogens from the mother. It allows the entry of antibodies from the mother passive induced immunity. It keeps the embryo separated from the mothers higher blood pressure. It prevents exchange of red blood cells avoiding the deadly possibility of agglutination. It supplies O2 from the mother. It excretes CO2 from the embryo to the mothers blood.

Human Reproduction

It secretes a variety of hormones including oestrogen and progesterone. The hormones maintain the pregnancy and prepare the mothers body for birth and lactation. The zygote divides many times by cleavage increase in the number of cells by division but no overall increase in size to double its cell number. A solid clump of about cells called the morula is formed. About 5 days after fertilisation the morula develops into a hollow ball called a blastocyst. The outer cells of the blastocyst form the trophoplast. This will become the membranes around the embryo.

The inner cells, called the inner mass will become the embryo. In normal development the sperm fertilizes the egg. The cortical reaction occurs raising the fertilization membrane and cell divisions occur until the blastula stage.

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When the embryo reaches the blastula stage the embryo releases an enzyme that dissolves the fertilization membrane and the young embryo swims free to continue development. The mesoderm cells further develop into the muscles and blood, the endoderm develops into the digestive tract and lungs, and the ectoderm develops into the skin, nerves and brain.

The Gestation period is the length of time from fertilisation to birth. Oxytocin is produced by the pituitary gland. This hormone causes contractions of the uterine muscle. This is the beginning of labour. Stage 1: The contractions push the foetus down toward the cervix. The membrane around the foetus amnion breaks. The amniotic fluid is released through the vagina. Stage 2: The cervix dilates widens and the foetus is pushed out through the cervix and vagina. At this time the umbilical cord is cut.

Lactation is the secretion of milk by the mammary glands of the mother. Colostrum is a thick yellow fluid produced during the first few days. It is low in fat and sugar but rich in minerals, protein, and antibodies. Prolactin is a hormone produced by the pituitary gland. This hormone stimulates milk production. The suckling of a baby at the breast stimulates the mothers pituitary to release prolactin. When breast feeding stops the mother stops secreting prolactin and therefore stops producing milk.

Suckling also stimulates the pituitary to secrete oxytocin. Oxytocin causes the milk ducts to contract ejecting the milk from the breast. Human milk has a lot of advantages for the babys growth and development. Human milk is nutritionally balanced for a developing human baby. It also contains a wide variety of beneficial chemicals that include mothers antibodies.

These antibodies protect the child against common pathogens. Human milk also contains chemicals favourable for brain growth and development. Human milk also encourages the growth of mutualistic bacteria in the large intestine. Contraception is the deliberate prevention of fertilisation.

Human Reproductive Biology | NHBS Academic & Professional Books

There are 4 methods: 1. Natural contraception: a. Abstinence: No sexual intercourse. Temporary abstinence: No sexual intercourse during the most fertile period of the menstrual cycle. Withdrawal: The penis is removed from the vagina before ejaculation.