What is the embryonic period?
The embryonic period of development is the stage in which most organs are formed. Organs begin to form, and the embryo elongates and starts to assume a human-like shape. The heart and main blood vessels are formed, and the heart starts beating by the 6th week.
What body parts develop during the embryonic period?
Basic structures of the embryo start to develop into areas that will become the head, chest, and abdomen. During the embryonic stage, the heart begins to beat and organs form and begin to function. The neural tube forms along the back of the embryo, developing into the spinal cord and brain.
What happens at the end of the embryonic period?
The Embryonic Period It lasts from the third through the eighth week after conception. During this period, cells continue to differentiate and at 22 days after conception the neural tube forms which will become the brain and spinal column.
What is the earliest embryonic stage?
The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
What is the correct order of embryonic development?
Hence the correct answer is ‘C’ i.e, Zygote-morula-blastula-gastrula-embryo.
What are the blastula stages?
An early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel. The blastula follows the morula and precedes the gastrula in the developmental sequence.
What is the first organ to develop in the embryo?
The heart is the first organ to form during development of the body. When an embryo is made up of only a very few cells, each cell can get the nutrients it needs directly from its surroundings.
What week does the heart form?
During the first few weeks of pregnancy, your tiny embryo is shaped like a flat disk. By 5 weeks, two tubes that will become the heart have formed. The two tubes fuse together and blood flows through this tubular “heart” as it begins to beat. Between 6 and 7 weeks, the heart tube twists and bends into an S shape.