Constriction occurs when the muscular walls of blood vessels contract.
Dehydration causes vessels to constrict and blood to thicken.
Constriction causes blood to thicken.
What causes blood to thicken?
[A] Constriction
[B] evaporation
[C] heat or cold
[D] thirst
[E] permineralization
[F] sweating
[G] flow of electrons
[H] matter vibrating