in order to regulate the flow of blood to the body's organs as well as maintain homeostsasis
your penis gets bigger
If the blood of the circulatory system is missing, then you have a dessicated corpse or mummy of some kind.
you will die
blood clott
during cellular respiration
You would die.
Even during gestation, fetal kittens have a closed circulatory system.
The most important change is the reproductive system becoming fertile. Also there are many emotional changes .
you will not have enough blood cell cause they will die
closed circulatory system (double circulatory system)
autonomic nervous system
they improved oxygenation of tissues