In order to appreciate the importance of the cell membrane, compare a cell membrane to a window screen. Both the cell membrane and a window screen allow certain things to pass through it, but keeps other things out. What are some things that can pass through a window screen? What are some things that cannot pass through a window screen? Why is it important to keep these things from moving through the screen?

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.

How do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.