The Nervous/Endocrine System
By Will Hooks

The Nervous System is how we command our body to move, and our body tells us what we feel.

It starts with our Brain sending a signal down our spine to our nerves. The electrical signal sent from our brain travels 355 miles per hour to our nerves!

To put that in perspective, look at this:

Different Parts of the Brain

There are four main parts of the Brain:

Cerebrum: The Cerebrum is the largest part of the human brain, and the neocortex is the biggest part of the Cerebrum. The neocortex is only found in mammals, and is thought to allow 'Greater' information processing and thinking. It is only found in more evolved mammals such as Dolphins, Humans, and Primates (Monkeys); Being only found in more evolved animals it is also thought the neocortex was recently evolved.

Cerebellum: Also known as "Little Brain", is similar to the cerebrum in that it has two hemispheres and has a highly folded surface or cortex. It is paired with moving, coordinated movement, and balance.

Limbic System: Deals with emotions, the senses, thirst and hunger, learning, and converting short term memory to long term.

Brain Stem: Controls vitals, such as Heartbeat and breathing. All signals from the brain travel through the Brain Stem.

After the signal leaves the Brain Stem it travels through the spine, like a car on a highway it runs down the spinal cord and takes the appropriate exit to reach the appropriate nerve.

Different Types of Nerves

There are 3 different types of nerves, Sensory, Spinal, and Motor.

Sensory: The Sensory nerves take in all of the senses, like smell, sight, touch, taste, and hearing. They are then routed back to the Brain for processing.

Motor: These nerves control your voluntary movements(Movements you want to happen, not like your heart beating, that would be in-voluntary). They tell your muscles to move.

Spinal: The Spinal nerves are very important in that it carries the signals from the sensory and motor nerves to the body and brain. There are 31 pairs of spinal nerves in the human body.

Endocrine System

Your brain also controls a set of organs called The Endocrine System. The Endocrine System controls and releases hormones to your body.  There's a good diagram about these here:

Let's break this down:

The Pituitary Gland: is the part of the brain that operates this system.

Thyroid Gland: The Thyroid Gland is also has a lot of power. Found in your neck, the Thyroid Gland controls how much proteins your body creates and how your body reacts to other hormones.

Adrenal Gland: Responsible of releasing hormones for stress such as Adrenaline and Noradrenaline.

Pancreas: Producing important hormones such as Insulin and Glucagon. It also doubles as a digestive organ, secreting pancreatic juices that assist digestion.

Ovaries: Only found in females, the Ovaries creates the female reproductive cell, the Egg.

Testis: Only found in Males, the Testis are the male version of the Ovaries. They produce the male reproductive cell, Sperm, and also produce testosterone, which makes men usually angrier and more territorial.

Thanks to you all for reading!

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