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Q&A
Circulatory system Which
structures connect the arteries and veins? Capillaries Which
vessels transport blood away from the heart and have thick muscular walls? Arteries Which
vessels transport blood toward the heart and have valves? Veins Which
part of the heart receives blood from the lungs? The left
Atrium Why is
the circulatory system important to humans? Blood
carries the oxygen around the body The
system that ensures all cells nutrients Gets rid
of wastes Helps
fight diseases Circulates
hormones throughout the body Which
structures are included in the circulatory system? The heart Arteries Veins Capillaries Why are
capillaries small and thin? So red
blood cells can collect as much oxygen as possible when hey travel through them.
Gases
that enter or leave the bloodstream must diffuse through membrane. The thin
nature of these vessels ensures efficient diffusion. Name the
parts of the heart. Why do you suppose the heart needs all these parts? Left +
Right atriums, left + right ventricles
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