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List and explain the three fundamental economic questions that must be answered by all economic systems.
Cardiac Muscle
Specialized muscle tissue found only in the heart, responsible for the heart's contractile force and continuous pumping action.
Neurotransmitter
Chemical messengers that transmit signals across a chemical synapse, from one neuron to another target neuron.
Cardiac Muscle
A specialized form of striated muscle found in the walls of the heart, responsible for pumping blood throughout the body.
Atrial
Pertaining to the atria, the two upper chambers of the heart that receive blood entering the heart.
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