Contents. List of Contributors. Introduction to Volume 4 (S.L. Bonting). The Physiological Basis for the Influence of Weightlessness on Heart and Lungs (F. Bonde-Petersen and D. Linnarsson). Neuromuscular Adaptation to Actual and Simulated Weightlessness (V.R. Edgerton and R.R. Roy). Metabolic Effects of Spaceflight: Cosmos Missions Overview (I.A. Popova and A.I. Grigoriev). Gravitational Neuromorphology (I.B. Krasnov). Plant Responses to Simulated Microgravity (Y. Masuda, S. Kamisaka, R. Yamamoto, T. Hoson, and K. Nishitani). Gravitropic Mutants in Studying Plant Growth in Space (H. Takahashi and H. Suge). Effects of Gravity on the Cellular Response to Epidermal Growth Factor (P.J. Rijken, J. Boonstra, A.J. Verkleij, and S.W. de Laat). Searching for Intelligent Life in the Universe: Nasa's High Resolution Microwave Survey (G.R. Coulter, M.J. Klein, P.R. Backus, and J.D. Rummel). Virtual Environments: New Media for Spatial Information (S.R. Ellis). Index.