Answer:
they are usually prepared by clerks for developing record of messages
Answer: A
Explanation: The blood–air barrier (alveolar–capillary barrier or membrane) exists in the gas exchanging region of the lungs. It exists to prevent air bubbles from forming in the blood, and from blood entering the alveoli. ... The barrier is permeable to molecular oxygen, carbon dioxide, carbon monoxide and many other gases.
When it involves granting favors it's called quid pro quo.
<h3><u>Answers;</u></h3>
-less than 1%
-Thrombopoiesis
-Megakaryoblast
-Thrombopoietin
-Megakaryocyte
-Proplatelets
-Platelets (thrombocytes)
<h3><u>Explanation</u>;</h3>
- Platelets (or thrombocytes) make up less than 1% of formed elements with a concentration between 150,000 and 400,000 per cubic millimeter. The production of platelets is called thrombopoiesis.
- From the myeloid stem cell, a committed cell called a megakaryoblast is produced. It matures under the influence of thrombopoietin to form a megakaryocyte.
- Megakaryocytes are easily distinguished both by their large size (about 100 micrometers [μm] in diameter) and their dense, multilobed nucleus. Each megakaryocyte then produces thousands of platelets.
- The process of how megakaryoctes produce thrombocytes was in question until 2007. Researchers reported that megakaryoctes produce long extension from themselves called proplatelets.
- While still attached to the megakaryoctye, these proplatelets extreough the blood vessel wall in the red bone marrow. The force from the blood flow "slices" these proplatelets into the fragments we know as platelets (thrombocytes).
