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Regulation of Heart Rate › Viewthe acceleration of heartbeat is done by:
A. Somatic nervous system
B. autonomic nervous system
C. sympathetic nervous system
D. parasympathetic nervous system
Respiratory System › View
Internal respiration is gas exchange between
A. The blood and the cells of the body
B. The atmosphere and the blood
C. The nose and the nasal cavity
D. The atmosphere and the nose