Explain how megakaryocytes form platelets
What will be an ideal response?
Megakaryocytes undergo repeated rounds of mitosis without experiencing cytokinesis during anaphase and telophase. The megakaryocyte becomes a massive cell with multiple copies of DNA located in a single nucleus. Mature megakaryocytes extend arms into the bloodstream. The force of blood lops off small pieces that become platelets. Each megakaryocyte arm can form thousands of platelets.
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The term "epicardium" is synonymous with:
A) fibrous pericardium B) parietal layer of serous pericardium C) visceral layer of serous pericardium D) endocardium
It the interval between R waves is on an ECG is 0.80 sec, then the heart rate is ________
A) 70 beats/min B) 80 beats/min C) 75 beats/min D) 65 beats/min
Along with the ribs and sternum, what other bones make up the thoracic cage?
A) 7 cervical vertebrae B) 12 thoracic vertebrae C) 5 lumbar vertebrae D) 7 cervical and 12 thoracic vertebrae E) 12 thoracic and 5 lumbar vertebrae
Which occurs during the secretion of hydrochloric acid by gastric epithelial cells?
A. Bicarbonate ions are secreted into the hepatic portal circulation. B. There is a decrease in the pH of blood in the hepatic portal circulation. C. Both H+ and K+ are actively pumped from the epithelial cell cytosol into the lumen of the stomach. D. Chloride ions are pumped from the cytosol of the gastric epithelial cells into the hepatic portal circulation blood. E. Vesicles containing H+/K+ -ATP-ase proteins are endocytosed into vesicles within the gastric epithelial cells.