The embryo will remain one until the eighth week of pregnancy, when it becomes a fetus. During the First Trimester the placenta and umbilical cord develop. These together bring nutrients to the fetus, and also removes waste from the fetus. The Placenta also releases the Human Chorionic Gonadotropin Hormone (HCG), HCG helps to maintain pregnancy and it affects the development of the baby. The Amniotic Sac also develops, which is a fluid-filled membrane that supports the developing fetus.
It is the physical condition in which a woman’s body is nurturing a developing embryo or foetus. STAGES OF PRENATAL DEVELOPMENT. Germinal stage This stage covers two weeks after fertilization. The zygote undergoes rapid cell division then migrates slowly down the mother’s fallopian tube and is implanted in the uterine wall. The placenta begins to form enabling the developing zygote to attach itself to the mother’s uterine wall.
Difference between Normal and Cancerous Cells Dominique Clay Strayer University SCI 115 Mrs. Tamara Allen Difference between Normal and Cancerous Cells Based on your data and observations, what are some of the Differences between normal cells and cancer cells? A cell starts out in the stage Interphase where the cell is at rest. Next the cell if it needs to reproduce it goes through Prophase; which is the first stage of mitosis where the cell’s nucleolus and nucleus fade away and the chromatin forms chromosome spindles that appear between the centrioles that have now gone to the opposite poles of the cell. Next comes Metaphase where the sister chromosomes line up in the middle of the cells attaching to the spindles by their centromere. Then the sister chromosomes divide at the centromere retreating to opposite sides of the cell, this is called Anaphase.
CONCEPTION PHYSICAL Conception is the beginning of human development and happens when the sperm meets an egg. In the first month, the first two weeks will be the embryo attaching itself to the uterine wall. After 25 days, the baby’s body will start to develop (only the head, followed by the trunk and arm buds). The heart will also start beating. By 30 days, the baby will be a quarter of an inch long.
During this period, the organism grows vastly in size. But right before the fetus is formed, the eyes, ears, nose, jaw and neck form along with the arms, legs, fingers, and toes. The internal organs are more distinct as intestines grow, the heart develops spate chambers, and the liver and spleen take over red blood cell production. The video went on to say that after two months, an embryo becomes a fetus. It also said that the fetus’s heart beats twice as fast as an adult.
One day before conception the woman ovulates and produces one mature ovum. During the conception process one sperm out of millions by the man may penetrate the outside layer of the ovum and fertilize it. The start of pregnancy is about 10 days after conception. 14 days after conception it has now developed into the fetus central nervous system. Its heart begins to beat and at this time the woman might have noticed that her menstrual period is late.
Embryonic Stem Cell Research A stem cell is a type of cell that can give rise to more cells of its kind, with at least one type of specialized cell. Human bodies possess different kinds of stem cells in different stages of life, and embryonic stem cells exist only in the first few weeks of human life, when humans are embryos. Embryos are fertilized eggs formed when a human egg and sperm fuse together and begin to undergo cell division. After about five days from the first division embryos develop into a hollowed-out ball of fluid that contains around 150 cells called a blastocyst. A part of the blastocyst will become the placenta, which will serve to nurture the growing embryo.
Risks and benefits of amniocentesis Chelsea Webb SCIN132 D011 Win 12 Professor Kennard Sproul The risks and benefits of amniocentesis Amniocentesis is an invasive procedure used to collect cells from the fetus for genetic testing. Amniocentesis is done in a pregnant woman of around 15 to 20 weeks of gestation. Amniotic fluid is the fluid around the fetus in the uterus. The procedure involves taking the amniotic fluid around the fetus to collect cells that are shed from the skin of the fetus. These cells are used in different tests like karyotype i.e., knowing the number and type of chromosomes.
Steroids consist of cholesterol which comes from placentas in the womb. They can also derive from the adrenal gland or gonads that are testes or ovaries. Steroids play a huge part of the determination of the physical development of individual from the early ages in life to when we age and in all fertility cycles. Peptides control such functions as sleep, and distribution of sugar. Psychologists have not been able to determine the extent to which biological causes may affect the gender of an individual, but the evidence is expanding in which biological factors may explain, and offer an insight of the lifelong mystery of the formation of gender.
The fallopian tubes are narrow tubes which are attached to the upper parts of the uterus and serve as tunnels for the ova to travel from the ovaries to the uterus. (See diagram 1 & 2) The menstrual cycle (Diagram1) (www.patient.co.uk) The female reproductive system (Diagram 2) How does the female reproductive system work? The female reproductive system is controlled by five main hormones released both by the brain, and the ovaries. The hypothalamus is the part of the brain that secretes the hormone called gonadotropin releasing hormones (GnRH).The pituitary gland also release two hormones called follicle stimulating hormone (FSH) and Luteinsing hormone (LH) both are carried in the blood stream to the ovaries, where it stimulates the immature ova to start growing and also triggers ovulation and encourage the formation of the corpeus luteum. The combination of all of these hormones gives women their reproductive cycle.