The cell part that is used to describe the outer edge of a frog blood cell is called the cell membrane<span>. It is the outermost organelle of animal cells.</span>
Answer:
D. Activated platelets release chemicals that activate more platelets.
Explanation:
When a stimulus or a change in some condition triggers a response that intensifies the changing condition, the mechanism is called a positive feedback mechanism.
Any damage to tissues makes the platelets to contact and stick to parts such as collagen fibers of the connective tissue present under the damaged endothelial cells. This process of platelet adhesion activates the platelets and brings about changes in them. The activated platelets grow many projections to contact and interact with one another. They also release ADP and thromboxane A2 which in turn activates the nearby platelets. The ADP makes other platelets in the area sticky. The stickiness of the newly recruited and activated platelets causes them to join the originally activated platelets. Eventually, the accumulation and attachment of large numbers of platelets form a platelet plug.
Here, release of chemicals from the activated platlets to activate more platlets represents the positive feedback mechanism.
Answer:
All biological drawings should be titled. Shading specific areas of a diagram might look aesthetic to the eye, but this practice is not acceptable in biology. Hence, the advice is to AVOID at all cost.
Explanation:
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Answer
Nutrition in an Amoeba occurs through a process called phagocytosis
Explaination
where the entire organism pretty much engulfs the food it plans on eating up. ... It involves the ingestion, digestion and egestion of food material. Amoeba does not have any specialized organ for nutrition.
