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.
Answer:
Explanation:
Elderly people are particularly at risk of vitamin B12 deficiency because of the high prevalence of atrophic gastritis-associated food-cobalamin (vitamin B12) malabsorption, and the increasing prevalence of pernicious anaemia with advancing age.
Answer:
The given question is not complete as it lack the proper option Which are as follow-
a. Moving the client as little as possible
b. Preparing the client for mannitol administration
c. Stimulating the client to maintain responsiveness
d. Monitoring the client for increasing intracranial pressure - is correct answer.
Explanation:
According the symptoms that is shown by the client mentioned in the question which are, - losing sense of time, nausea, drowsiness and headache. These symptoms are suggested that an individual client is having increased intracranial pressure.
The intracranial pressure is the pressure that is present inside the brain. As it is the pressure that is present in cerebrospinal fluid and brain tissue.
Thus, the correct answer is - option d.
I think the answer might be Euchromatin. Chromatin exist in two forms. One being Euchromatin which is less condensed and can be transcribed.
To happy the way you are no matter who you are what gender you are (its hard for people to be their selves these days) be happy that you are living in the world where people could love you for who you are like your family your friends. Just remember you have all the love and support for you. Be yourself dont conceal anything anymore let it all go show the world who you really are, show the world that you aren't afraid anymore, leave all the past behind you and focus on the future. You'll be on the perfect path if you just follow your heart. follow you heart cause it knows the way to a perfect path of your life. always be yourself no matter what
Ive always wanted to say this quote :)
