Blood comes from the Right Atrium, Through the Tricuspid Valve, and into the right ventricle, then through the Pulmonary Valve and into the lungs where it takes a load of oxygen. The Pulmonary nerve takes blood to the Left Atrium then through the Mitral Valve and last to the Left Ventricle. Now let’s talk about the digestive system.When you eat food it goes in your mouth and the food is chewed into bits. .After, the salivary gland makes the bits of food slippery so the food can go down the esophagus. Seconds later it travels through the stomach and into the small intestine. Little while later it is in your large intestine, after that the food goes in your rectum and down to the anus. The eye is about the size of a ping pong ball . The pupil is in the middle of the eye, the iris is surrounding the pupil. Therefore the window to the eye is the Cornea. The cornea focuses light as it passes through.Did you know the iris is behind the cornea, it is the thing that makes the eyes colourful.. In the middle of the iris is a black circle called the pupil, the iris has muscles attached to it to control how much light comes in from your pupil.
The pupil is an opening to let the light come in,
the more light there is the smaller your pupil is. Blinking protects your eyes and gives moisture.
Light passes through the lens. Lens take the light back where the seeing really starts to happen.
They are attached the fibre muscles which is attached to the ciliary.
The ciliary muscles help change the lens making it focus a lot or less.
To see something near the ciliary muscle make the lens become thick,
to see something far the ciliary muscles make the lens thinner.
Behind the lens is the retina which is the back wall of the eyeball. Lens focus the light onto the Retina. The Retina has lots of light sensitive cells called rods and cones, there are 120 million rods and 7 million cones in each eye WOW!
Rods see in black, white and shades of gray. Rods help us see the shape of things they also help us see in the dark.
Cones are sensitive to one of three colours Red, Green or blue together they let us see millions of colours. Cones need more light to work then rods. Messages are sent through the octave nerve. Messages are sent to the brain by the octave nerve, it sends messages about what they are seeing.
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