Human Physiology involves multiple interconnected systems:
Circulation of blood: The cardiovascular system transports oxygen, nutrients, and waste products.
Neural communication: The nervous system controls voluntary and involuntary actions.
Hormonal regulation: The endocrine system regulates metabolism, growth, and reproduction.
These systems work in harmony to maintain homeostasis and support life processes.
Final Answer:
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\boxed{\text{All of the above}}
\]