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1. There are millions of alveoli (gas exchange surface), so they have a very large surface area collectively, which is further increased by having a folded membrane. A larger surface areas means there...

In our bodies we have a host of cells that make up our immune system. The immune system itself can be divided into the innate and adaptive immune response. If we use an analogy, the innate immune system a...

Proteins travel to the Golgi Apparatus where they are modified (e.g. glycosylation) and packaged into vesicles. Vesicles then travel to, and fuse with, the cell surface membrane. This causes the release o...

Define stroke volume as the volume of blood expelled by the left ventricle into the aorta per contraction of the heart.Idea that as blood volume in the ventricle increases, this stretches the sarcomeres o...

For speciation to occur, two populations of a species must become reproductively isolated. This can result from either the formation of a geographic barrier between two populations of the species, prevent...