Erythrocytes: a) originate ultimately from the same pluripotent stem cells as white blood cells. b) survive on average 4 years. c) produce antibodies. d) actively secrete hemoglobin. e) more than one answer is correct

Erythrocytes: a) originate ultimately from the same pluripotent stem cells as white blood cells.

Explanation:

Red blood cells are biconcave discs made up of hemoglobin. Its function is to transport oxygen, by binding to hemoglobin, from the lungs to all parts of the body.

They derive from the stem cell of the bone marrow and are, in origin, cells with nucleus whose maturation in the marrow is carried out with the synthesis of hemoglobin and the loss of function of the nucleus, which is finally expelled. Right now, that new cell is called a reticulocyte, which turns into a red blood cell or red blood cell when it loses material and gets smaller. The mature red blood cell passes into the bloodstream.

They have a half-life of about 120 days and once reached their end they are eliminated by the liver and spleen.

e) more than one answer is correct:

Explanation:

Pluripotent  cell  are group of cells which can replicate to all embryonic cells that will later develop to adults.Thus they are  refereed to as embryonic stem stem.

In the bone  marrow pluripotent  stems cells produces (progenitor)original cells from which myeloid and lymphoid  originated from.These are the two lineages of Pluoripotent stem cells in human.

.Myeloid cells in the bone marrow give rise to erythrocytes and megakaryocytes.

The  lymphoid cells gives the T&B-lymphocytes, ( the B-cells produce plasma cells which produces antibodies)and natural killer cells. These are all types of Leukocytes.(WBC).

The erythrocytes  produced in the bone marrow constantly secret hemoglobin.its life-span is average of days-120 days, not in years, since they lack nucleus.

Thus options A- which states RBC is from the same pluoripotent cells with the WBC, and option D- that RBC secrets haemoglobin are both correct, thus E is the right answer.

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects

thinking it would be physical characteristics