<Table> <Tr> <Td> </Td> <Td> This article needs attention from an expert in medicine . Please add a reason or a talk parameter to this template to explain the issue with the article . WikiProject Medicine may be able to help recruit an expert . (February 2009) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs attention from an expert in medicine . Please add a reason or a talk parameter to this template to explain the issue with the article . WikiProject Medicine may be able to help recruit an expert . (February 2009) </Td> </Tr> <P> Tonic in physiology refers to a physiological response which is slow and may be graded . This term is typically used in opposition to a fast response . For instance, tonic muscles are contrasted by the more typical and much faster twitch muscles, while tonic sensory nerve endings are contrasted to the much faster phasic sensory nerve endings . </P>

Drive refers to the concept of the stimulus for action