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