Answer:
The stomach is J-shaped and it can expand to temporarily store food. Partial digestion of the food takes place here. The churning action of the stomach muscles physically breaks down the food. The stomach releases acids and enzymes for the chemical breakdown of food.
Explanation:
The "polar" zones have the greatest temperature range.
Answer:
A. Increase
B. Increase
C. Decrease
D. Remain fairly constant or change slightly
E. Increase
F. Increase
Explanation:
A. Following deep breathing of room air, the partial pressure of oxygen in plasma will increase because of higher concentrations of oxygen.
B. Following deep breathing of room air, the partial pressure of carbon dioxide in plasma will decrease because because of higher concentrations of oxygen and increase in oxygen uptake by the lungs.
C. Following deep breathing of room air, respiratory drive will decrease of saturation of blood and tissue with oxygen.
D. Following deep breathing of room air, plasma oxygen content will remain fairly constant or change just slightly because the oxygen saturation levels will have been attained.
E. Following deep breathing in and out of a small paper bag, respiratory drive will increase because of the higher levels or increase in partial pressure of carbon dioxide
F. Following deep breathing in and out of a small paper bag, plasma carbon dioxide content will increase as carbon dioxide are produced from exhalation while oxygen is not being replenished.
Cells are so small so the surface area and volume of them can be proportional to each other. This helps with the efficiency of the cell's absorption and waste expulsion processes. Also by the cell's smallness, communication from the nucleus to other organelles is fast and the cell can be regulated while the conditions for diffusion are still ideal.Its because they need to be able to diffuse through materials easily. Also, materials inside and outside of the cell need to easily pass through the cell membrane, which makes it harder and slower for the materials to pass through the cell membrane.
The number of electrons in a neutral atom equals to the number of protons in the nucleus.
