Their smooth muscle is less than arteries. Elastic fibers provide recoil which is what you need in arteries to propel the blood forward. Veins lack these which is why large amounts of blood can be stored in them without the walls providing any sort of recoil and keeping pressure low.elative to the walls of arteries, the veins' walls are thinner, because the pressure of the blood in the veins is much lower; so low in fact, that valves are required to prev â¦ ent blood in the veins flowing backwards.
The plant Agave americana, which is sometimes called American aloe, belongs to the Asparagaceae, a different family. The genus is native to tropical and southern Africa, Madagascar, Jordan, the Arabian Peninsula, and various islands in the Indian Ocean (Mauritius, Reunion, RÃ©union, comoros.). etc
Aloe plants are native to tropical regions, but even if you live in a place with cold winters you can have a beautiful, healthy aloe plant that you keep indoors. Aloe plants should be potted in a soil mix made for succulents. They like to be dry and warm, not wet and cold, so water only when the soil is mostly dried out. Healthy aloe plants produce babies you can break off and pot for a friend.