Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 40, Problem 8RQ
Platelet plug formation occurs at which point?
- when large megakaryocytes break up into thousands of smaller fragments
- when platelets are dispersed through the bloodstream
- when platelets are attracted to a site of blood vessel damage
- none of the above
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Students have asked these similar questions
Which of the following are true of platelets?
(Please note that you may pick more than one)
Platelets derive from bone marrow cells
Platelets are the primary cell for hemostasis
Platelets are ellipsoidal in shape
Platelets have a lifespan of 21 days
Describe the function of platelets.
Multiple Choice
O
O
O
O
Phagocytosis of pathogens and foreign debris
Carries oxygen and carbon dioxide
Reduces blood loss from damaged blood vessels
Transports lipids and some hormones through the circulation
Platelets are capable of which of the following? Select all that apply.
activate clotting enzymes
attract WBCs such as neutrophils to the site
stimulating vessel repair and re-growth
phagocytosis
stimulating vasoconstriction
dissolving clots
Chapter 40 Solutions
Biology 2e
Ch. 40 - Figure 40.10 Which of the following statements...Ch. 40 - Figure 40.11 Which of the following statements...Ch. 40 - Figure 40.17 Varicose veins are veins that become...Ch. 40 - Why are open circulatory systems advantageous to...Ch. 40 - Some animals use diffusion instead of a...Ch. 40 - Blood flow that is directed through the lungs and...Ch. 40 - White blood cells: can be classified as...Ch. 40 - Platelet plug formation occurs at which point?...Ch. 40 - In humans, the plasma comprises what percentage of...Ch. 40 - The red blood cells of birds differ from mammalian...
Ch. 40 - The heart's internal pacemaker beats by: an...Ch. 40 - During the systolic phase of the cardiac cycle,...Ch. 40 - Card io myocytes are similar to skeletal muscle...Ch. 40 - How do arteries differ from veins? Arteries have...Ch. 40 - High blood pressure would be a result of...Ch. 40 - Describe a closed circulatory systemCh. 40 - Describe systemic circulationCh. 40 - IS. Describe the cause of different blood type...Ch. 40 - List some of the functions of blood in the body.Ch. 40 - How does the lymphatic system work with blood...Ch. 40 - Describe the cardiac cycleCh. 40 - What happens in capillaries?Ch. 40 - How does blood pressure change during heavy...
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- What causes platelets to adhere to the wall of a broken vessel? exposure of collagen fibers histamine secreted by mast cells smooth muscle from the broken vessel wall prostacyclinarrow_forwardAn infection in the skin, such as a pimple, often produces pus. The major component of pus is: Toxic oxygen molecules released by macrophages Toxic nitrogen molecules released by macrophages NETs released by neutrophils Dead epithelial cells killed by lysozyme Dead and dying neutrophilsarrow_forwardWhich of the following are mechanisms which prevent clotting under normal circumstances? Select all that apply. platelets are not released into the bloodstream until needed heparin and anti-thrombin circulate in the bloodstream vessels are coated with prostacyclin which repels platelets clotting enzymes are not released into the bloodstream until needed rapid blood flowarrow_forward
- platelets serotonin platelet plug formation megakaryocytes coagulation coagulation fibrin hemophilia vascular spasm clot thromboxane A2 pulmonary embolism megakaryocytes are huge cells found in red bone marrow that extend long tendrils into blood sinusoids. The flow of blood breaks off small portions of those tendrils creating the formed element known as platelets Platelets are involved in the process of hemostasis. If a blood vessel is severed in an injury, a reflex in the smooth muscle of the vessel wall constricts the broken vessel. This first phase of hemostasis is called vascular spasm This results in reduced blood flow and promotes the success of the remaining two phases of hemostasis. The second phase of hemostasis is platelet plug formation where platelets stick to the collagen revealed in the damaged area of the vessel wall. This attracts other platelets in a positive feedback mechanism. During this process, platelets degranulate, and release the vasoconstrictor serotonin and…arrow_forwardplatelets globulins fibrinogen erythrocytes leukocytes connective plasma fibrinogen coagulation albumin men women formed elements Blood is a tissue that consists of formed elements and an extracellular matrix called The formed elements include red and white blood cells, and cell fragments called Plasma: The fibers of the extracellular matrix are actually fiber precursor molecules called Plasma consists of water, protein, nutrients, electrolytes, wastes, hormones, and gases. Plasma contains a multitude of proteins. However, three proteins predominate. contributes towards blood viscosity and helps transport lipophilic substances in the blood. , otherwise known as antibodies, help combat specific pathogens. Finally, upon activation, fibrinogen forms fibers during the process of are cells and cell fragments found in the blood. serve to transport gases in the blood. are blood cells of the immune system that combat pathogens. are cell fragments that assist in the process of blood clot…arrow_forwardWhich of the following cells are matched CORRECTLY with their precursor cell? megakaryocyte, erythrocyte lymphoid stem cell, neutrophil myeloid stem cell, monocyte reticulocyte, thrombocytearrow_forward
- Normally, fluid enters the lymphatic capillaries as a result of active transport. TRUE or FALSEarrow_forwardDifferentiate histologically a blood vessel from a lymphatic vessel. Explain in long explanationarrow_forwardDescribe the structure and function of each of the following cell types 1. Basophils 2. Neutrophils 3. Macrophages 4. Dendritic cells 5. Eosinophils Which cells are phagocytic?arrow_forward
- Which cell is responsible for initiating the inflammatory response within a tissue? basophil neutrophil mast cellarrow_forwardFigure 18.13 Are you able to recognize and identify the various formed elements? You will need to do this is a systematic manner, scanning along the image. The standard method is to use a grid, but this is not possible with this resource. Try constructing a simple table with each leukocyte type and then making a mark for each cell type you identify. Attempt to classify at least 50 and perhaps as many as 100 different cells. Based on the percentage of cells that you count, do the numbers represent a normal blood smear or does something appear to be abnormal? Figure 18.13 Leukocytes (Micrographs provided by the Regents of University of Michigan Medical School © 2012)arrow_forwardA neutrophil detects a pathogen, which step would most likely happen next? Increase in intracellular levels of Arp2/3 Decrease in intracellular levels of Arp2/3 Neutrophils do not respond to pathogens. Decreases in capZarrow_forward
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