Hello, reader of this blog all of you know the human reproduction system this is not wrong to get knowledge about this topic.
Not only do science students need to know this but all students can know it.
Every organ system in the human body works continuously to maintain homeostasis for the survival of the individual.
The human reproductive system of the individual the human reproductive system is essential for the survival of the species.
An individual may live a long healthy life without producing offspring. but reproduction is inevitable for the existence of a species.
The reproductive system has four main functions namely.
- To produce the gametes namely sperms and ova
- Transport and sustain these gametes
- Nurture the developing offspring
- Produce hormones
The major reproductive events in human begins are as follows
Gametogenesis: Formation of gametes by spermatogenesis and oogenesis.
Insemination: Transfer of sperm by the male into the female genital tract,
Fertilization: Fusion of male and female gametes to form a zygote, called fertilization.
Cleavage: Rapid mitotic division of the Zygote which converts the single-celled
zygote into a multicellular structure called a blastocyst.
Implantation: Attachment of blastocyst to the uterine wall
Placentation: Formation of the placenta which is the intimate connection between the fetus and the uterine wall of the mother
for the exchange of nutrients.
Gastrulation: Process by which blastocyst is changed into a gastrula with three germ layers.
Organogenesis: Formation of specific tissues, organs, and organ systems from three germ layers.
Parturition: Expulsion of the fetus from the mother’s womb.
Reproduction is a process that helps in the continuity and maintenance of a species Human beings are sexually reproducing and viviparous.
The reproduction events include gametogenesis insemination and placentation. gastrulation, organogenesis, and parturition.
The female reproductive system consists of a pair of ovaries uterus, a cervix, a vagina, and external genitalia.
The male reproductive system consists of a pair o testes, pair of duct systems, accessory glands, and external genitalia called the penis.
The process of formation of gametes in the male is called spermatogenesis and in the female is called oogenesis.
The reproductive cycle in females menstrual cycle and it is initiated at puberty.
The ovum released during the menstrual cycle is fertilized by the sperm and the zygote is formed.
The zygote undergoes repeated mitotic division and the blastocyst is implanted in the walls of the uterus.
It takes about 280 days or 40 weeks for the entire development of the human fetus and it is delivered out through the process of childbirth or parturition.
The newborn baby is breastfed by the mother.
World breastfeeding week (WBW)
August 1st week
STAGES OF FOETAL DEVELOPMENT
4 weeks – Formation of foregut midgut and hindgut. The heart starts functioning forebrain is the most prominent Upper limbs appear as paddle-shaped buds
8 weeks- Limbs and digits fully formed Movements start taking place. The neck appears between the head and thorax. External genitalia shows sex differences.
12 weeks- Eyes and ears are well-defined. Ossification of long bones is seen in urine formation and begins.
16 weeks – Lower limbs reach final development. Movements are seen.
20 weeks – The length of the fetus increases. Hair on the head and eyebrows. skin becomes covered with sebaceous
24 weeks – Lungs are well developed Rapid eye movements begin fetus starts gaining weight.
28 weeks – Immune system starts developing central nervous system developed. The retina is well developed.
32 weeks – Body weight increases rapidly skin is smooth due to the deposition of subcutaneous fat.
36 weeks – Blood vessels are completely developed Bady is positioned into the pelvis head down position
40 weeks – Bady is fully formed Ready to be born any day.
Do you know?
- The female uterus contains one of the strongest muscles of the human body.
- The sperm is the smallest human cell and the ovum or gg is the largest human cell.
- Out of the millions of eggs, women possess during birth only about 300 to 400 will ovulate before menopause.
- On the other hand, males produce more than 500 billion sperm in their lifetime.
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