● The functions of the `color{violet}("organs/organ systems")` in our body must be coordinated to maintain `color{brown}("homeostasis.")`

● `color{brown}("Coordination")` is the process through which two or more `color{violet}("organs interact")` and complement the functions of one another.

● For example, when we do physical exercises, the `color{violet}("energy demand")` is increased for maintaining an increased muscular activity.

● The `color{violet}("supply of oxygen")` is also increased.

● The increased `color{violet}("supply of oxygen")` necessitates an increase in the rate of respiration, `color{violet}("heart beat")` and increased `color{violet}("blood flow via blood vessels.")`

● When physical exercise is stopped, the activities of `color{violet}("nerves, lungs, heart")` and `color{violet}("kidney")` gradually return to their normal conditions.

● Thus, the functions of `color{brown}("muscles, lungs, heart, blood vessels, kidney")` and `color{brwn}("other organs")` are coordinated while performing physical exercises.

● In our body the `color{brown}("neural system")` and the `color{brown}("endocrine system")` jointly coordinate and integrate all the activities of the `color{violet}("organs")` so that they function in a `color{violet}("synchronised fashion.")`

● The `color{violet}("neural system")` provides an organised network of `color{brown}("point-to-point connections")` for a `color{violet}("quick coordination.")`

● The `color{violet}("endocrine system")` provides `color{brown}("chemical integration")` through `color{violet}("hormones. ")`

● The `color{violet}("neural system")` of all `color{violet}("animals")` is composed of highly `color{violet}("specialised cells")` called `color{brown}("neurons")` which can detect, receive and `color{violet}("transmit different kinds")` of stimuli.

● The `color{violet}("neural organisation")` is very `color{brown}("simple")` in lower invertebrates.

● For example, in `color{violet}("𝐻𝑦𝑑𝑟𝑎")` it is composed of a `color{brown}("network of neurons")`.

● The `color{violet}("neural system")` is better organised in insects, where a `color{brown}("brain")` is present along with a `color{brown}("number of ganglia")` and `color{brown}("neural tissues.")`

● The vertebrates have a more developed `color{violet}("neural system.")`

● The `color{violet}("human neural system")` is divided into two parts:

(i) the `color{brown}("central neural system")` (CNS)

(ii) the `color{brown}("peripheral neural system")` (PNS)

● The `color{brown}("CNS")` includes the `color{brown}("brain")` and the `color{brown}("spinal cord")` and is the site of information processing and control.

● The `color{brown}("PNS")` comprises of `color{brown}("all the nerves")` of the body associated with the CNS (`color{violet}("brain and spinal cord")` ).