Embryonic Stage Research Paper

1. These enzymes are used by the sperm to create an opening in the corona radiata, zona pellucida, and plasma membrane of the oocyte for the sperm to pass through

During the third to eighth week of conception, fingers, arm bones, and toes are being formed. Limbs start off as buds that then extend outward. This is all due to the DNA that is in each and every cell in the body.

A teratogen is a substance that acts as a toxin that can cause a birth defect. A teratogen can be a prescribed medication, a street drug, alcohol use, or even a disease present in the mother that can cause an increased risk for the baby to be born with a birth defect. Some teratogens may cause birth defects that are noticed immediately at birth and some you can’t determine for several years. Usually the more and longer the developing fetus is exposed to teratogens the worse the consequences will be.

Biological development of a fetus is vary rapid and complex over the nine-month period in the womb. When both the male spermatozoon and the female ovum combine it forms what is called a zygote which holds the twenty-three pairs of chromosomes. The zygote or the embryo undergoes cell division and makes its way to the uterine wall to implant itself, this process is completed about ten days after conception. By the end of the eighth week the organ systems have formed and human characteristics can start to be noticed. From the eighth week until birth the embryo is now labeled a fetus. Quickening can occur from the sixteenth week until birth, this is where the mother can feel the fetus moving. Around the twenty-second week viability can take place, this is where the fetus can survive outside the womb. The nine-month period of being pregnant is split into different trimesters. With the different trimesters there are different abortion procedures can be used to remove the fetus.

According to the Centers for Disease Control and Prevention (CDC), birth defects results in one of every 33 babies. Teratogens account for 4 out of 5% of birth defects when chemical and drugs are in the system. The use of this or even infections can cause abnormal fetal development.

A teratogen is any agent or factor that can disrupt the development of an embryo or fetus, which may cause a birth defect or malformation. Whether it is a medication, disease or drug, when the mother is exposed the chances of problems arising with the baby increase. Only ten to fourteen days after conception teratogens can affect the fetus. At that stage in the pregnancy the egg has already been fertilized and attached to the uterus. This is known as the embryonic stage where if health isn’t a priority complications can occur. At this point the mother and embryo share a common blood supply therefore anything the mother does affects the embryo. This is also the stage in which most miscarriages occur. There are numerous teratogens but two

Many young children are vaccinated every day, but do you know what is in vaccines? Almost all vaccines have one ingredient in common: cells from aborted baby fetuses. The medical community needs to realize it is not appropriate to use fetus cells in vaccines for many reasons.

Teratogens can harm an embryo. Most will not kill an embryo. However, any large quantity of teratogens like nicotine will

Pregnant women have a higher risk to exposure of ionizing radiation and non-ionizing radiation because of the many procedures that they have to go through for their medical procedures (Williams, 2010). Some of the nonionizing exposures could include radio frequencies, microwaves and especially ultrasounds in women when going for their monthly checkups. When looking at ionizing radiation, in utero exposure could be carcinogenic, mutagenic, or teratogenic (Williams, 2010). Carcinogenic is radiation that directly causes cancer. Mutagenic involves when X-rays are capable of creating a mutation. Teratogenic can interrupt with normal embryonic development and produce risks with the developing fetus. These effects depend on the exposure level of the radiation and the stage of the fetal development (Williams, 2010). Regardless of the dose of radiation, the long term risk of their offspring having autism is still increased. The amount of radiation that the mother and the child should be exposed to should be monitored and kept at a low dose through the entire pregnancy. Ultrasounds have been a big issue in how it can cause a child to have Autism spectrum disorder (ASD). Risks of Ionizing radiation during pregnancy depends on the amount of prenatal exposure and the stage of development the embryo is at. During organogenesis, two to seven weeks of fertilization, is when the embryo has a higher risk to major effects of radiation (Williams, 2010).

    According to parents.com, after conception, a fetus begins to develop rather quickly. In the fifth week of pregnancy, a baby’s heart begins to beat. A baby also develops three distinct layers, ectoderm, endoderm, and mesoderm. These three layers will eventually form the body systems that are necessary

First trimester: By 12 weeks of pregnancy the foetus will be fully formed. The ovum grows and develops certain important parts of the baby’s body such as spinal cord, nervous system, gastrointestinal system, heart and lungs in the first four weeks from conception. The heart starts beating and brain and other organs forms by eight weeks. At this stage, the face is formed and arms and legs start to move. The baby grows to 3 inches long and

According to dictionary.com a teratogen is “a drug or other substance capable of interfering with the development of a fetus, causing birth defects”. Teratogens are also substances that are found in the environment which are known to cause defects in fetal development. Teratogens are one of the leading causes of death to newborns in the nation. “There are four major factors that depend on the extent of fetal defects and those are the dosage, genetic makeup of the mother and the developing fetus, fetal age, an other negative influences on pregnancy” (Berk, 2012). Some of the common teratogens include alcohol consumption, exposure to radiation, environmental pollution, tobacco and or drug use, and certain prescription and non-

Why it is important in our society to know what teratogen is, and some ways to prevent this birth defect in our society. Teratogen is a agent that disturbs the development of an embryo. Well, what exactly causes these disturbances in the embryo? By taking medicine during pregnancy, medicine prescribe to new mothers can cause abnormality in pregnancy. Although many women take medications during pregnancy, the medicine prescribe can be harmful. A example may be a woman during pregnancy comes across morning sickness; therefore, she may ask her doctor to prescribe medicine to treat her morning sickness. A common medicine to take during the 60's was thalidomide. However, over the years researchers found that thalidomide caused partial absence

I know this question wasn't directed for me so I hope that you don't mind that I respond, but in my opinion I think the embryonic period is the most critical period because so many of the important organs are forming during this time like the heart, brain, spinal cord, and the process of sexual differentiation. The embryonic period is the most important period when the mother should live a healthy lifestyle free from any type of teratogens. She and the baby will benefit greatly from doing this because it could prevent the baby from being

The development of the first stage is birth to 4 weeks. This point is likewise recognized as the Neonatal Period. Infant are held with a number of abilities that become the foundation of future growth.