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
When taking care of your aloe vera plant, follow these plant care tips: 1  Choose an aloe vera-friendly container. Aloe vera has shallow roots that grow outwards rather than deep like most plants. 2  Use the right kind of soil. Aloe vera grows best in very well drained, sandy soil. 3  Place the aloe vera in an ideal location. Aloe vera plants need lots of sunlight and warmth in order to grow properly. Place the plant on a warm window sill that gets plenty of indirect sunlight, and preferably away from drafts. The leaves will start to brown if the plant is getting too much direct sunlight. Aloe vera plants can not tolerate cold temperatures and will freeze very easily. Go easy on the water. This is the most important of the 5 Aloe vera plant care tips. Over-watering Aloe vera plants is one of the main reason why many people are not successful with growing these plants. Aloe vera is a succulent which means it is at greater danger of over-watering than it is at under watering. Aloe vera should be watered every two weeks.