Megakaryocytes, and therefore platelets, develop in response to which hormone? O Thrombopoietin O Colony-stimulating factor O Interleukin O Erythropoietin
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Which substance stimulates the formation of platelets? A- Erythropoietin B- Immunoglobulins C- Thrombopoietin D- Cytokine The hemopoietic growth factor is a hormone involved in the proliferation of progenitor cells. T/F After testing your blood in the lab, you found that your red cells agglutinated with both anti-A and anti-B antisera. This means that you___________. A- Have A and B antigens on your RBC B- Have anti-A and anti-B antibodies in your plasma C- Are AB positive D- All of the above E- None of the above A megakaryoblast will develop into___________. A- A red blood cell B- A white blood cell C- A platelet D- None of the above Which statement does not describe a component of the RBC life cycle? A- Ruptured RBCs are removed by macrophages in the spleen and liver B- Heme is converted to bilirubin which ends up in the liver C- Transferrin transports the iron in the blood D- Urobilinogen is eliminated in the feces as stercobilin E- Biliverdin is the protein that stores iron Which white blood cell mainly destroys newly formed tumor cells? A- T cell B- Natural killer cells C- B cell D- Neutrophils Which of the following blood types is a person whose blood cells agglutinate by both anti-A serum and anti-B serum, but not by anti-Rh serum? A- AB negative B- AB positive C- O negative D- O positive E- None of the above Which of the following is a formed element found in blood? A- Lymphocyte B- Red blood cell C- Platelet D- White blood cells E- All of the above The extrinsic pathway of blood clotting _______________. A- It is activated by tissue factor B- It produces prothrombinase C- It inhibits coagulation D- A and B E- B and C Which of the following clotting factors is involved in strengthening and stabilizing a blood clot? A- Factor XIV B- Factor V C- Factor VII D- Factor XIII E- Factor XI
Adi S.
The hormonal stimulus that prompts red blood cell formation is (a) serotonin, (b) heparin, (c) erythropoietin, (d) thrombopoietin.
Sukhada S.
When tissue is damaged, usually platelets are also damaged. These damage platelets release a substance known as platelet derived trigger factor (PDGF). When PDGF attached to a particular tyrosine kinase receptor (TKR) on a cell, the TKR phosphorylates a number of intercellular sign labs that causes the cell to reproduce and repair the tissue damage. These intercellular signals include interacting with transport channels affecting ion concentration, and transcription signals that regulate the transcription of certain genes necessary for mitosis. This is an example of cell-to-cells communication. What is considered to be the signal in this example of cell-to-cell communication? A. Tyrosine kinase receptor B. Ion channels C. Platelets derived growth factor D. Transcription factors If there were a mutation and the shape of the PDGF changed so that it could no longer attach to the TKR, what would be the bet effect? A. Tyrosine kinase receptors would no longer work B. Protein synthesis would no longer occur in the cell C. Platelets would not longer be damaged and release PDGF D. The surrounding cells would not undergo mitosis and repair tissue damage
Katherine K.
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