Physiology

Metabolism

Plasma

Cell

Anabolism

Negative feedback

Unicellular

Catabolism

Positive feedback

Multi-cellular

Nucleic acids

Operating (set) point

Zygote

Carbohydrates

Feed forward regulation

Nerve cell

Proteins

Stimulus

Muscle cell

Lipids

Receptor

Connective tissue cell

Homeostasis

Afferent pathway

Epithelial cell

Extra-cellular fluid

Integrating center

Tissue

Intercellular fluid

Efferent pathway

Organ

Intracellular fluid

Effector

Organ system

Interstitial fluid

Response