As in other mammals, thermoregulation is an important aspect of human homeostasis. Most body heat is generated in the deep organs, especially the liver, brain, and heart, and in contraction of skeletal muscles. Humans have been able to adapt to a great diversity of climates, including hot humid and hot arid.
Japanese knotweed is a perennial weed, producing tall canes, up to 2.1m (7ft) in height during the summer. The canes have characteristic purple flecks, and produce branches from nodes along its length. These branches support shovel-shaped leaves.
A leafy green plant that is native to Japan, China, and Korea and is used as an herb. It has a flavor that is similar to a combination of sorrel and celery. It is popular as an addition to salads and vegetable dishes and as a garnish for Japanese fish recipes. It may become slightly bitter if it is cooked too long. Mitsuba is also known as Japanese parsley.