Gas exchange near tissues: Near the tissues the partial pressure of oxygen is less so oxyhemoglobin in the blood immediately dissociates to give away oxygen to the tissues.
Near the tissues the metabolized product carbon dioxide is more i.e. the partial pressure of carbon dioxide is more near tissues. A rise in partial pressure of CO2 of fall in pH, decreases oxygen affinity of hemoglobin, this is referred as Bohr's effect. Hemoglobin undergoes conformational changes that facilitates the release of oxygen.
Carbon dioxide must be transported from tissue to lungs for exhalation process. For this some part of CO2 (20-25%) binds with hemoglobin and gets transported as carbaminohemoglobin (HbCO2). Around 70% of CO2 is transported in the form of bicarbonate ions and the remaining 7% in the dissolved form in plasma.
One way of creating a variation in a population is through genetic replication errors. This will make new type of alleles. Environmental factors causes variation such as affecting enzyme activity and function. The changes would show in the phenotype of an organism.
Yes because a homogeneous mixture is a mixture that has the same uniform appearance and composition throughout while with heterogeneous you can see the different parts of the mixture and pick them out
