Skeletal, Muscular & Heart Practice Worksheet

D. SA node – AV node – Purkinje fibres. Thick walls, elastic tissue and smooth muscle are characteristics of . A. veins. B. arteries. C. arterioles. D. capillaries. Blockages in which of the following blood vessels reduces blood flow to the heart muscle? A. Aorta. B. Carotid artery. C. Coronary artery. D. Pulmonary artery. ................
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