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.
Always wash ur hands could be one
Answer:
The correct answer is - increased heart rate
Explanation:
When an individual exercise his cells of muscles requires additional oxygen to produce energy to work hard or intense workout. In such a case, the body's heart pumping the blood faster to supply oxygen and blood to the whole body, especially the organs and muscles that are being strained during the activity therefore it will beat at a faster rate and therefore the increased rate of the heart is the main body response.
Answer:
Ensuring that patients always receive the core measure recommended treatments requires a well-coordinated effort throughout hospital departments. Peers from across Johns Hopkins Medicine hospitals developed 40 core measure work groups, each focused on improving a specific set of core measures.
Explanation: