A summary of human pregnancy:-

Zygote:- single cell resulting from the fusion of a sperm nucleus with the nucleus of secondary oocyte at fertilisation; zygote usually forms in oviduct.

Morula:- Solid ball of about 16 cells called blastomeres,produced through cleavages of the zygote.

Blastocyte:-Ball of cells with surface layer and an inner cell mass. produced after the morula enters the uterus then , fluid enters the ball and lifts some cells to form a cavity.

Embryo:- Embryo refers to all development stage from two

 weeks after fertilisation unit the end of the 8th week. all major body structures begin forming during the  embryonic period.

Foetus:-Foetus refers to all developmental stages from the 19th

 week until birth, about 38th week after fertilisataion.  The rate of overall growth and structure elaborations increase dramatically during the foetal period.

Newborn:-Baby from0-28 days in called neonate, which can be

divided in to early neonate. The physiological  transition from life in the uterus to life in the   external world requires many gradual changes, as in respiration.

Infant:- Individual from 4 week to 1 year after birth. During infancy, Body weight triples and height doubles, on the average.

              

Cell Biology And It's Branches:-

1.Cytotaxonomy:-

 In the branch of cell biology which studies taxonomist in determining the taxonomical position of a species is call cytotaxonomy.

2.Cytoecology:- 

 In the branch of cell biology which studies the effects of ecological changes on the chromosome number of the cell is call cytoecology.

3.Cytogenetics:-

in the branch of cell biology which studies the cytological  and molecular basis of heredity, variation, mutation, phylogram, morphogenesis and evolution of organisms.

4.Cell physiology:-

 The cell physiology is the study of life activities, viz., nutrition, metabolism, excitability, growth, reproduction or cell division and differentiation of the cell.

5.Cytochemistry:-

 The cytochemistry is a branch of cytology which deals with the chemical and physio-chemical analysis of living matter.

6.Ultrastructure and molecular BIology:-

These are the most modern branches of biology in which the merging of cytology with biochemistry, physico-chemistry  and especially macromolecular and colloidal chemistry become increasing complex. 

7.Cytopathology:-

 The application of molecular biology to pathological science has helped in understanding various human disease at molecular level.

Sexual Facts:-

1.Sex reduce stress:- 

         

                   In today's busy life is no time for  rest. So our body are feel very stressful. But research show sex is most wonderful thing.

that getting busy calms nerves, lower body pressure, and reduce stress.

2.Feel better when you sick:-

you know about this even studies show that arousal and orgasm boost our body. and when sex occur our body reduce energy and feel good.

Lymphatic system:-

The lymphatic system removes excess fluid from the body’s tissue and returned in to the circulatory system. It also help the body to fight infections. It consists of lymph vessels, lymph nodes, and associated lymphoid organs such as the spleen and tonsils.  Lymph vessels form a network of tubes that extend all over the body. From lymph capillaries the smallest vessels-lymph flows in to larger vessels called lymphatics, which are studded with nodes. These modes are collection of lymph tissue that act where many scavenging white blood cells ingest bacteria and other foreign matter and debris. When an infections occurs, specialized white blood cells are released from the lymph nodes to fight the infections. 

Human Respiration System:-

Human respiration relies on an involuntary muscle reflex that reflex that makes the diaphragm and external intercostals muscle contract. This increases the volume of the chest cavity, and the pressure inside it drops. Air rushes in through the nose, down the trachea, and into the lungs, where an exchange of oxygen and carbon dioxide takes place. As the muscle relax, the air is forced back out of lungs.

Skeleton System

The human skeleton supports the body, protects the internal organs and provides anchorage for the muscles. It consists of bones and connective tissue called cartilage. Although an individual bone is around five times  stronger than a steel bar of similar weight,  the many joints in a skeleton allow a wide range of movement. The human skeleton contains 206 bones and consists of two main group: the axial skeleton and the appendicular skeleton. To allow for childbirth, the female pelvic cavity is shallower and wider than the man cavity.

Nervous system

The nervous system is a network of fibers and neurons controlling the actions and reaction of the body. The central nervous system comprise the brain and spinal cord, which receive and integrate singles relayed from the sense organs via the peripheral nervous system. The latter includes the autonomic nervous system, which controls unconscious functions, such as heartbeat and breathing.