Human Body- part 3 💀 Flashcards
What are rod cells
Rod cells work best when there is not too much light around. You’ve got 120 million of them, mostly around the outer regions of your retina.
What are cone cells
Cone cells let you see in colour, there are 7 million of them mist tightly packed in the fovea. They work best in bright light.
What are the 3 different type of cone cells
They’re called blue, red, and green. But that doesn’t mean that they only respond to light in that colour, each type of cone cell differs in its wavelengths (e.g. red is the longest wavelength). Together they allow us to see at least 2 million different colours.
What are light waves?
A light wave is a moving wave of energy made up of particles called photons. Light waves come in different lengths, and the lengths determine their colour.
Why are people colour blind?
People who are colour blind are either missing one of the three types of cone cells or have one type that doesn’t work properly.
What are the 3 parts of the ear and what is it?
The outer ear (pinna): the visible part we call the ‘ear.’
The middle ear: Sound waves cause the eardrum to vibrate, passing these vibrations to three bones (malleus, incus, stapes), which process and transmit the sound to the inner ear.
The inner ear: The bones send sound to the cochlea, which sends the signal to the brain to interpret what was heard.
What is the vestibular system?
The vestibular system senses changes in the head’s position and movement and transmits this information to the brain, which then re-establishs equilibrium.
What does the vestibular system consist of?
- The vestibular system is made up of three semicircular canals and two otolith organs
What is a gland
A gland is any organ in the body that releases chemicals.
What are the 4 types of teeth
- Incisors
- Canines
- Molars
- Pre- molars
What are incisors?
Your incisors are the most visible teeth in your mouth. Their primary function is to cut food. Most people have four incisors on the upper jaw and four on the lower. These include your front two teeth and the teeth on either side of them.
What are canines?
Canine teeth get their name because they resemble a dog’s fangs. They’re pointier than other types of teeth. People have four canine teeth. Canine teeth help you tear into foods like meat and crunchy vegetables.
What are molars?
Molars are the flat teeth at the rear of the mouth. They are used exclusively for crushing and grinding.
What is the white stuff on the outside of teeth called?
Enamel (toughest substance in the entire body)
What is below the enamel?
The dentin, (most of a tooth is made up of dentin)
