Circulatory System Quiz

Arteries carry blood away from the heart and have a thick layer of muscle tissue to keep them strong and a thick layer of elastic tissue so they can stretch and recoil. The high pressure of blood inside them is due to being pumped out from the ventricles of the heart.

Capillaries exchange substances with our cells, such as nutrients and oxygen, and remove waste products like carbon dioxide. They are adapted for this function with walls that are only a single cell thick and are permeable, allowing substances to easily diffuse through them. The total cross-sectional area of all the capillaries is huge, resulting in lower blood pressure and slower flow.

The structure of each type of vessel is related to its function. Arteries have a thick layer of muscle and elastic tissue to withstand high pressure, capillaries have a single cell thick wall and high cross-sectional area for efficient substance exchange, and veins carry blood back to the heart with valves to prevent backflow.

<p>Arteries have high pressure due to being directly pumped from the heart, capillaries have lower pressure and slower flow due to their huge total cross-sectional area, and veins have even lower pressure and utilize valves to maintain one-way flow back to the heart.</p> Signup and view all the answers

<p>Capillaries have a single cell thick wall, are permeable, and have a huge total cross-sectional area, enabling efficient diffusion of substances with cells in the body.</p> Signup and view all the answers

<p>Arteries carry blood away from the heart.</p> Signup and view all the answers

<p>Capillaries exchange nutrients and oxygen with the tissues and remove waste products like carbon dioxide.</p> Signup and view all the answers

<p>Arteries have thick layers of muscle tissue and elastic tissue to withstand high pressure and to stretch and recoil.</p> Signup and view all the answers

<p>Capillaries are tiny, with walls only a single cell thick and are highly permeable, allowing substances to easily diffuse through.</p> Signup and view all the answers

<p>The total cross-sectional area of capillaries is huge, leading to a much lower blood pressure compared to arteries.</p> Signup and view all the answers