By Dr Ananya Mandal, MD. Dopamine is a neurotransmitter released by the brain that plays a number of roles in humans and other animals. Some of its notable functions are in: 1  movement. 2  memory. 3  pleasurable reward.
Sycamores (Platanus spp.) are tall, spreading shade trees. These North American natives have few problems or pests, but their older bark flakes off in patches. If your sycamore is shedding bark, it may be a healthy, maturing tree.
There are three distinct types of sycamore trees. The North American sycamore is most common in the United States and parts of Canada, and are known as the largest of the species. This variety is known for its varied bark colors, which range from gray-green to whitewashed.