Answer:
Chloroplasts are very similar to mitochondria, but are found only in the cells of plants and some algae. ... Like the mitochondria, the chloroplast has an inner and outer membrane. Inside those membranes are its different parts, which include thylakoids and stroma.
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An ecosystem is like a machine that cycles matter by using:
captured energy.
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The plasma membrane and several cytoplasmic organelles such as the ER, Golgi apparatus, secretory granules and vesicles, lysosomes, endosomes, form an endomembrane system.
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Activated platelets release chemicals that activate more platelets-describes best the positive feedback mechanism of platelets
Explanation:
A positive feedback mechanism is a type of self-amplifying process triggered by a stimulus that leads to greater change along the same direction.
The steps in homeostasis of blood are – platelet adherence, platelet activation, platelet aggregation, coagulation.
When a blood vessel is damaged or injured, various chemicals are released which cause the platelets to adhere to the walls of the blood vessels. This action causes the platelets to release their own chemicals which stimulate the clotting process furthermore. This process is continuous until the injured bleeding blood vessel is corrected by a clot formation and is an example of positive feedback mechanism.
Platelet activation involves releasing of chemicals like cytokines, chemical mediators and coagulation factors; namely, thromboxane A2, ADP, PDGF, VWF, serotonin etc. Chemicals like ADP, VWF etc are released at high levels with increase in platelet plug formation.
A heart-healthy plan for everyone is to eat lots of fruits and vegetables. It's also important to eat low-fat dairy products.
The heart is a vital organ in the body as it keeps the circulation of blood. For children, they should be served fruits and vegetables everyday. They should also eat whole grains.
For adults, they should eat more fish and less red meat. They should also eat lots of fruits and vegetables. Nuts, beans, legumes, and low-fat dairy products are also important for the heart.
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