Nervous System - Nucleus - control (responding to certain neurotransmitters by allowing transcription factors to be formed)
Respiratory System - Plasma Membrane (alveoli allow certain particles into the cells but want to keep contaminants out)
Reproductive System - Nucleus - DNA (determines in part the genome and developmental process of the offspring)
Digestive System - Mitochondria (want full redox reaction to occur in the organelle based on nutrients extracted from food)
Integumentary System - Cytoskeleton (for support as well as in the construction of the basal lamina)
Musculoskeletal System - Endomembrane System (think about the sarcoplasmic reticulum and the effect of increased surface area when calcium is released)
Circulatory System - Passive Transport (through capillaries especially)