7. How does your respiratory and circulatory systems attempt to maintain homeostasis during exercise?

a. Your body produces more red blood cells to help provide energy to cells.

b. Your lungs produce more oxygen which is then delivered to the cells through the
blood.

c. You experience an increase in blood flow which provides nutrients to cells to
increase energy and remove wastes.

d. You experience an increase in breathing rate to obtain more oxygen which is
delivered to cells through the bloodstream.

The dna in a cell’s nucleus encodes proteins that are eventually targeted to every membrane and compartment in the cell, as well as proteins that are targeted for secretion from the cell. for example, consider these two proteins: phosphofructokinase (pfk) is an enzyme that functions in the cytoplasm during glycolysis. insulin, a protein that regulates blood sugar levels, is secreted from specialized pancreatic cells. assume that you can track the cellular locations of these two proteins from the time that translation is complete until the proteins reach their final destinations. for each protein, identify its targeting pathway: the sequence of cellular locations in which the protein is found from when translation is complete until it reaches its final (functional) destination. (note that if an organelle is listed in a pathway, the location implied is inside the organelle, not in the membrane that surrounds the organelle.)