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in the early weeks of embryonic life,primitive., nucleated red blood cells are produced in the yolk sac.during the middle trimester of gestation,the liver s main organ for production of red blood cells but reasonable number are also produced in the spleen and lymph nodes.then during the last month or so of gestation and after birth red blood cells are produced exclusively in the bone marrow.the bone marrow of essentially all bones produces red blood cells untill a person is 5 years old.the marrrow of long bones,except for proximal portions of the humeri and tibiae,becomes quiet fatty and produces no more red blood cells after about age 20 years.beyond this age,most red cells continue to be produced in marrow of membranous bones,such as vertebrae,sternum,ribs and ilia.even in these bones,the marrow becomes less productive as age increases
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoOccurs only in red marrow of flat bones like sternum, ribs, skull, pelvis and ends of long bones.
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How does a fetal sternum differ from an adult?
The ossific centers appear in the intervals between the articular depressions for the coastal cartilages, in the following order: in the manubrium and first piece of the body, during the sixth month; in the second and third pieces of the body, during the seventh month of fetal life; in its fourth piece, during the first year after birth; and in the xiphoid process, between the fifth and eighteenth years. Its component parts are not fused in the fetus.
Describe a body position that can exist when all major body parts are flexed?
When all major body parts are flexed it is the fetal position.
What is the site of fetal development?
The site of fetal development is the uterus. It refers to an organ that is found in the lower body of a woman or a female mammal.
If the body cells of an organism have 10 chromosomes then the sex cells produced during meiosis would have?
5
How does the body regulate blood glucose levels?
Regulation of blood glucose is handled by the body's production of insulin. Insulin moves the glucose that is produced during digestion out of the bloodstream and into cells.
When does the female body produce Estriol?
Estriol is produced in a woman's body during pregnancy. It is made by the placenta by a sulfate in the woman's body, which is an androgen steroid that's made in the fetal liver within her body.
How does a fetal sternum differ from an adult?
The ossific centers appear in the intervals between the articular depressions for the coastal cartilages, in the following order: in the manubrium and first piece of the body, during the sixth month; in the second and third pieces of the body, during the seventh month of fetal life; in its fourth piece, during the first year after birth; and in the xiphoid process, between the fifth and eighteenth years. Its component parts are not fused in the fetus.
Describe a body position that can exist when all major body parts are flexed?
When all major body parts are flexed it is the fetal position.
Why our body change during puberty?
It is your body changing from the child stage to the adult stage.
Where is waste produced during ATP construction stored in your body?
mouth
One substance that is produced during respiration and and excreted by the body?
CO2
What is one substance that is produced during respiration and excreted by the body?
CO2
How many fetal bones are their in a body?
39
What kinds of cells are produced during Meiosis?
Body cells with 46 chromosomes
During a class on the circulatory system an airman asks you how much blood does the average adult have circulating in his or her body your answer is?
During a class on the circulatory system, an Airman asks you, "How much blood does the average adult have circulating in his or her body?" Your answer is, A: 5-6 liters
What is the purpose of the changes in body state produced during stress?
well it all has to do with the nerves
What is the site of fetal development?
The site of fetal development is the uterus. It refers to an organ that is found in the lower body of a woman or a female mammal.
