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Control how we think, feel, and react to outside stimuli

Control and communicate all over the body

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Neuron: A specialized cell transmitting nerve impulses

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Sensory Neurons - Nerve cells activated by sensory input
Motor Neurons - Transmit impulses, control muscles movements
Interneurons - Transfers signals and communicates to each other

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Brain

Spinal Cord

Brain: The central organ of the human nervous system. It consists of the cerebrum, the brainstem and the cerebellum.
Spinal Cord: It is a long, thin, tubular structure made up of nervous tissue. It connects the brain to nerves throughout the body.

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Consists of the nerves and ganglia outside the brain and spinal cord.
Nerves: Responsible for the control of the body and communication
Ganglia: Relay motor responses

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Produce hormones that regulate the body

And other many things

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Hypothalamus - located in the lower central part of the brain. Regulates of satiety, metabolism, and body temperature

Pituitary - located at the base of the brain. Secretes a lot of hormones and controls a lot of bodily functions

Thyroid - located in the lower front part of the neck. Produces thyroid hormones that regulate metabolism

Parathyroids - Are two pairs of small glands embedded in the surface of the thyroid gland. Release parathyroid hormone

Adrenals - Triangular-shaped glands located on top of each kidney. Produces corticosteroids and catecholamines

Pineal body - Located in the middle of the brain. It secretes melatonin

Reproductive organs - The main source of sex hormones. Produces androgens for males, and estrogen and progesterone as well as eggs for females

Pancreas - Elongated organ located toward the back of the abdomen. Secretes digestive enzymes and insulin and glucagon

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A regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action.

EX: Melatonin - regulates sleep-wake cycles. Secreted from pineal gland