Species and tissue variation in extraneuronal and neuronal accumulation of XXXX .

@entity19 @entity840 @entity95 @entity6115 @entity35 @entity6688 @entity1063
1. The ability of arterial and non-arterial smooth muscle in five tissues (vas deferens, heart, bladder, colon, spleen) in four species ( @entity19 , @entity95 , @entity35 , @entity840 ) to accumulate and retain @entity1063 (NA) was measured in thin tissue slices exposed to NA for 30 min, then washed in cold saline solution for 30 min. NA accumulation was assessed histochemically by measuring the fluorescence brightness of the tissue with the Leitz @entity6688 microphotometer. In addition, similar measurements were made on smooth muscle in the cat spleen, on cardiac muscle and on the terminal adrenergic nerves.2. In general, arterial smooth muscle had a greater capacity to accumulate and retain NA than non-arterial smooth muscle, but there was a great species and organ variability. The ability to accumulate and retain NA was best developed in the @entity19 , followed by the @entity95 , @entity35 and @entity840 in that order. Among organs the artery to the vas and the coronary arteries showed the greatest retention. Among non-arterial smooth muscle the @entity19 vas and the @entity95 colon were notable.3. Cardiac muscle accumulates NA during exposure to the @entity6115 but, unlike smooth muscle, cannot retain it when washed with NA-free solution.4. Terminal adrenergic nerves in different tissues show some variability in fluorescence intensity, and this is increased after exposure to NA. This may indicate a variable capacity of these cells to accumulate and retain NA.
