In the human embryo, the first site of blood formation is the yolk sac. Later in embryonic life, the liver becomes the most important red blood cell-forming organ, but it is soon succeeded by the bone marrow, which in adult life is the only source of both red blood cells and the granulocytes. Their job is to transport oxygen to the body's tissues in exchange for carbon dioxide, which is carried to and eliminated by the lungs. Red blood cells are formed in the red bone marrow of bones. Stem cells in the red bone marrow called hemocytoblasts give rise to all of the formed elements in blood. Erythroid (red blood) cells are the first cell type to be specified in the postimplantation mammalian embryo and serve highly specialized, essential functions throughout gestation and postnatal life. The existence of 2 developmentally and morphologically distinct erythroid lineages, primitive (embryonic) and definitive (adult), was described for the mammalian embryo more than a century ago. Cells of the primitive erythroid lineage support the transition from rapidly growing embryo to fetus, whereas definitive erythrocytes function during the transition from fetal life to birth and continue to be crucial for a variety of normal physiologic processes. Over the past few years, it has become apparent that the ontogeny and maturation of these lineages are more complex than previously appreciated. In this review, we highlight some common and distinguishing features of the red blood cell lineages and summarize advances in our understanding of how these cells develop and differentiate throughout mammalian ontogeny.
I think its all of the above
Answer:
I gochu
Explanation:
Abuse is a problem for society in many ways. Obviously, there are different types of abuse, I'll stick with physical and verbal.
What to write:
Abuse can be a huge problem for society in many different ways. As one might know, physical abuse can lead to hospitalization, while verbal abuse can lead to low self-confidence and depression. this can effect the families and friends of the victims by the victims deciding to stray away from others. They may be scared of what the family member or friend might think, or what they might do. Often, abusive relationships happen when someone is in love, so the victim might still be in love with the abuser.
Answer:
time-out area or maybe dugout?
Explanation:
I think this may be false, I know at my old school we did a reach and stretch type flexibility test
