If something slows an asteroid, it may fall towards the Sun, towards Mars, or towards Jupiter. As both Jupiter and Mars move past the asteroids in their orbits, they may be pulled slightly towards those huge bodies in their orbits. In fact, Phobos and Diemos, the two tiny moons of Mars, may be captured asteroids.
Resistance - is opposition to flow and is a measure of the amount of friction blood encounters as it passes through the vessels. Blood flow (F) is directly proportional to the difference in blood pressure (Î´P) between two points in the circulation, that is, the blood pressure, or hydrostatic pressure, gradient. Thus, when Î´P increases, blood flow speeds up, and when Î´P decreases, blood flow declines.
The law states that blood flow is proportional to the fourth power of the vessel's internal radius. Therefore, if a blood vessel's radius doubles in size due to vasodilation, the blood flow through the vessel will increase 16 fold. Blood flow can be regulated to individual organs, or it can be considered in total. Total peripheral resistance is defined as the total resistance to flow of blood in the systemic circulation. The arterioles are important regulators of blood flow because of their smaller size and muscular walls.