Best Answer: 1. Dilator pupillae-dilator (radial) muscle-innervated by sympathetic nervous system (Alpha-1 receptors)- increases the size of pupil (mydriasis) 2. Constrictor (circular muscle) pupillae-constricts the pupil (miosis) ex during accommodation reflex. just now. Report Abuse. Radial muscles and circular muscles. When the radial muscles contract the size of the pupil is increased. When the circular muscles contract the size of the pupil is decreased. Changing the size of the pupil controls the amount of light entering the eye.
sustain & protect. Thinning for forest health. An acre of land can only grow so much wood. One acre of fertile forestland may be able to sustain 500 little trees, or 100 big trees. Thinning is an effective and powerful forest management tool that promotes timber growth and restores forest health. When thinning a forest, slower growing or defective trees are removed to provide more space for the remaining trees to grow. The result is that available water and soil nutrients benefit those that remain, resulting in bigger, healthier trees in a shorter period of time.
Thinning perennials refers to the removal of stems from a plant. The benefits of thinning perennials are improved appearance, increased flower size, and disease prevention. To thin a plant, cut the stems to the ground in spring. A rule of thumb is to thin one in three stems.