Please refer to the following art to answer the following questions. 
-The one-way flow of blood in veins is maintained by ________.
Definitions:
High Blood Pressure
A condition where the force of blood against artery walls is too high, often leading to health problems like heart disease.
Menstrual Cycle
The monthly process of hormonal changes that prepare the female body for pregnancy, culminating in menstruation if no pregnancy occurs.
Anxiety
A feeling of worry, nervousness, or unease, typically about an imminent event or something with an uncertain outcome.
Post-formal Thought
A stage of cognitive development that goes beyond Piaget's formal operational stage, involving more complex, reflective, and contextual thinking.
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