why does the post-Medieval skull in the video have such bad teeth? Since saliva normally helps neutralize acid and replace minerals on teeth, a lack of saliva leads to more cavities. Dentists sometimes give a patient antibiotics after a teeth-cleaning procedure, especially if the patient is older or has heart disease.
What is the direct cause of demineralization?
Chemical demineralization of teeth is caused by acidic attack through two primary means: dietary acid consumed through food or drink and microbial attack from bacteria present in the mouth.
Why is it difficult to breathe at the top of Mount Everest quizlet?
Why is breathing more difficult at high altitudes, such as at the top of Mount Everest? a.) The lower atmospheric pressure reduces the ability of the body to pump air into the body.
Which feature is common to gills lungs and tracheae?
identify 2 structures common to gills, trachae, lungs and one unique. Common features include large surface area, short diffusion distance (a thin gas exchange membrane), and a mechanism that keeps fresh air or water moving over the gas exchange surface.
What might be a consequence of the warming effects of climate change for fishes living in a pond quizlet?
What might be a consequence of global warming for fishes living in a pond? As the planets warms, aquatic habitats such as a pond will contain less dissolved oxygen, reducing the ability of fishes to acquire oxygen for their respiratory needs.
How does altitude affect air pressure and density quizlet?
The higher the altitude, the lower the air pressure. The lower the altitude, the greater the air pressure. Explain why it is more difficult to breathe at the top of a mountain than at sea-level. It is more difficult to breathe at higher altitudes because the gas molecules are LESS DENSE and are spread farther apart.
Why do the circulatory systems of land vertebrates have separate circuits to the lungs and to the rest of the body quizlet?
The large decrease in blood pressure as blood moves through the lungs may prevent efficient circulation through the rest of the body. The changes in blood pressure as blood moves through the lungs of land-dwelling vertebrates make it necessary to have separate circuits to the lungs and the rest of the body.
Why are spiders lungs called book lungs?
Book lungs get their name from the fact that the stacked plates have the appearance of the closed pages of a book. A photograph of the underside of a spider illustrating the book lungs (white patches) at the top of the abdomen. Photograph by Kaldari.
What is an advantage to breathing water instead of air?
Water has lower O2 content, greater density, and greater viscosity. Describe the properties of respiratory surfaces. Respiratory surfaces are always moist. The movement of O2 and CO2 across moist respiratory surfaces takes place entirely by diffusion.
Which organ is not used for respiration?
So, the correct option is 'bladder'.
What might be a consequence of the warming effects of climate change for fishes living in a pond?
Higher inland water temperatures may reduce the abundance and distribution of wild fish stocks in lakes by reducing water quality, longer dry seasons, fish mortality, introduction of new predators and pathogens, and changes in the prey abundance for fish.
Why does the reporter have a tube up his nose?
Why does the reporter have a tube up his nose? To accurately measure core temperature. This reporter is participating in a study within a room that is heated.
What adaptations are observed in trachea and lungs to reduce water loss?
What adaptations are observed in trachea and lungs to reduce water loss? A) A countercurrent exchange system reduces water loss in animals with either trachea or lungs.