Explanation:
Objective lenses are responsible for the primary image formation in microscopes, they are the closest part to the object, it defines the image's quality and they determine the magnification and resolution. In an optical microscope you can usually find 3 or 4 objectives (4x, 10x, 40x and 100x) but other configurations and magnifications are possible, in the image I added you can see that.
<em>To determine which objective you will use you need to consider your specimen's size and what are the smallest features in it, NA (numerical aperture) must be considered as well, this is the ability to gather light and it determines depth of focus (how much you can focus without change in the image's sharpness), brightness and resolution (smallest distance between two objects). You'll also need to identify your observation method (phase contrast, darkfield, fluorescence, etc) and in what medium is your sample.</em>
I hope you find this information useful and interesting! Good luck!
Secretin increases the flow of bicarbonate ions from the pancreas into the small intestine to neutralize stomach acid.
Gastric acid regulation, pancreatic bicarbonate modulation, and osmoregulation are the three primary roles of secretin. Pancreatic fluid stimulation and bicarbonate secretion are two of secretin's main physiological effects.
Peptide hormones released by endocrine cells in the digestive system include secretin and CCK. While CCK enhances the synthesis and secretion of bile juice and pancreatic enzymes, Secretin stimulates the release of water and bicarbonate ions from the pancreas.
A pancreatic fluid that is high in bicarbonate is secreted when secretin is present. By interacting with pancreatic ductal cells, secretin enters the bloodstream or intestinal lumen and increases the production of bicarbonate, which lowers the pH of the gastric chyme as it enters the small intestine.
To learn more about the small intestine refer to:
brainly.com/question/1751875
#SPJ4
Answer:
I believe the answer would be A
Explanation:
You would have more fossils of animals that lived longer time ago than recent one bc they would be more older and more beneath the ground.And for animals to fossilize takes a long time so more older animals would be fossils
Answer:
natural selection
Explanation:
According to my research on different DNA and Genetics studies, I can say that based on the information provided within the question this pattern can be explained by the principle of natural selection. This principle states that organisms with favorable traits are more likely to survive and reproduce, thus passing those traits on to the next generation. Which is the main concept of the Theory of Evolution.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.