The Correct answer is A (This is Correct)
Answer:
Endothelium provides a slick surface lining all hollow cardiovascular organs.
Explanation:
Endothelium is a layer made of cells that lines the interior surface of the entire circulatory system from heart to the capillaries. It forms the interface between the blood in the lumen and the vessel wall.
It is a single celled thin layer of squamous cells. It is involved in fluid filtration, maintaining the the blood vessel tone, homeostasis, hormone trafficking and neutrophil recruitment. It is of mesodermal origin. It is aligned in the direction of fluid flow.
Epithelia are layers of cells that line body surfaces and organs. Different types of epithelia have specific functions and structures. Simple columnar epithelium, stratified squamous epithelium, pseudostratified columnar epithelium, and endothelium are all examples of epithelial tissues.
Epithelia are layers of cells that line body surfaces and organs.
Simple columnar epithelium is a single layer of rectangular cells, commonly found in areas of absorption and secretion.
Stratified squamous epithelium is several layers of squamous cells, providing protection against abrasion. Pseudostratified columnar epithelium appears layered but is actually a single layer of cells, often found in the respiratory system.
Endothelium is a type of epithelium that lines blood vessels, providing a smooth surface and allowing for the movement of blood cells.
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B. a segment of a protrein
C. a part of the cell membrane
D. a complete protein
The answer is A. a segment of DNA
B.depth of the soil
C.a measure of how developed a soil is
D.the relative amounts of sand, silt, and clay particles
Answer:
Option C, positive feedback
Explanation:
The process described in the question is known as Platelet plug formation. In this process, after the adherence of platelet, the collagen starts binding with the platelet’s receptor thereby by activating it. After activation, platelet releases cytokines and chemical mediators such as serotonin, coagulation factors, thromboxane A2, vascular endothelial growth factor, ADP, VWF etc. Both ADP and VWF are mainly responsible for adhering nearby platelets. This is positive feedback loop because the more and more platelets are adhered; the more and more ADP and VWF levels increase.
Option C is correct
B. adaptive radiation.
C. coevolution.
D. punctuated equilibrium.