have stimuli and responses in the same direction

can regulate blood glucose level

are not essential for blood amino acid level regulation

are open loop systems

are utilized when a sudden dramatic change within a very short

period is required

pH is higher than ICF pH

has an osmolality of 290 ± 0.5 mosm/kg

chemical

composition is relatively constant compared to ICF

has Na⁺ and Cl^- as major cations

is the relative constancy of the external environment

is important for survival of an organism

of blood pressure can be done without involvement of nervous system

is achieved mainly by open loop systems

operates on the basis of principle of positive feedback