Electrolysis Practice Exam

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What controls blood circulation?

Endocrine system
Nervous system
Autonomic system
Muscular system

The correct answer is: Autonomic system

The autonomic system plays a crucial role in controlling blood circulation. This system operates primarily below the level of consciousness and regulates involuntary bodily functions, including heart rate and the contraction and relaxation of blood vessels. By influencing the smooth muscles in the arteries and veins, the autonomic system adjusts blood flow according to the body's needs, such as during exercise or rest. While the endocrine system does release hormones that can affect blood circulation, such as adrenaline increasing heart rate, it does not directly control circulation as the autonomic system does. The nervous system is involved in communication and coordination of body functions, but it is through the autonomic division that specific control of blood circulation is achieved. The muscular system helps propel blood through the veins (via skeletal muscle contraction) but does not directly regulate the circulatory system itself.