The human circulatory system consists of a complex branching pipe network ranging in diameter from the aorta(largest) to the capillaries (smallest). The average radii and the number of these vessels
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The human circulatory system consists of a complex branching pipe network ranging in diameter from the aorta (largest) to the capillaries (smallest). The average radii and the number of these vessels are shown in the table. Does the arerage blood velocity increase, decrease, or remain consiant as it travels from the aorta to the capillaries?
The human circulatory system consists of a complex branching pipe network ranging in diameter from the aorta (largest) to the capillaries (smallest). The average radii and the number of these vessels are shown in the table, Does the average blood velocity increase, decrease, or remain constant as it travels from the aorta to the capillaries? $$\begin{array}{lcc} \hline \text { Vessel } & \text { Average Radius, mm } & \text { Number } \\ \hline \text { Aorta } & 12.5 & 1 \\ \text { Arteries } & 2.0 & 159 \\ \text { Arterioles } & 0.03 & 1.4 \times 10^{2} \\ \text { Capillaries } & 0.006 & 3.9 \times 10^{9} \\ \hline \end{array}$$
The aorta has an inside diameter of approximately $2.1 \mathrm{cm},$ compared to that of a capillary, which is about $1.0 \times 10^{-5} \mathrm{m}(10 \mu \mathrm{m}) .$ In addition, the average speed of flow is approximately 1.0 $\mathrm{m} / \mathrm{s}$ in the aorta and 0.30 $\mathrm{mm} / \mathrm{sina}$ capillary. Assuming that all the blood that flows through the aorta also flows through the capillaries, how many capillaries does the circulatory system have?
Lainey R.
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