What is the name of the structure at the end of the long pointer that allows ions to pass through the cell membrane

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

What organ systems are working to you cool down after a workout?

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?