Describe the functioning of the heart in terms of the contraction of muscles of the atria and ventricles and the action of the valves

Explain the pupil reflex in terms of the antagonistic action of circular and radial muscles in the iris

Describe the mammalian nervous system in terms of: (a) the central nervous system (CNS) consisting of the brain and the spinal cord (b) the peripheral nervous system (PNS) consisting of the nerves outside of the brain and spinal cord