Nervous System and Excretory System

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It enables you to sense your environment and to react to it.

It includes your brain, spinal

cord, and nerves.

2 parts: Central Nervous System and Peripheral Nervous System

Sensory organs

Examples: eyes, ears, touch sensors in your skin

a gap between nerve cells that signals travel along

They detect changes in your soundings and send signals along nerves to the central nervous system.

An automatic response to a stimuli.

The brain is bypassed in a reflex action!

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The nerve signal takes a shortcut.

The spinal cord tells the body to respond to the stimulus before the message even reaches the brain.

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It is the system that removes waste (ammonia) from the blood.

It includes kidneys and bladder.

Kidneys: filter liquid waste from your blood

Ureters: tube urine flows through to get to the bladder.

Bladder: muscular organ that hold urine until it is full

Urethra: It is a tube that connects the bladder to the outside of the body. Urine leaves the body through this tube.