1)What is meant by the term "typical spinal nerve unit"? With the aid of a simple diagram, describe and explain the components of such a unit.
2)Using diagrams as required, describe the mechanism by which one breathes in and out a) passively (as sitting behind a desk), and b) actively (as in severe exercise).
3)Venous return from the limbs, particularly the lower limb, to the heart is a complex process. Explain with diagrams as appropriate the mechanism(s) that facilitate venous return from the lower limb.