Repitition skin and eyes

Sarah broke her wrist and the doctor put a cast on her arm. Initially, the cast feel tight around her arm, but after a while she doesn't notice it anymore.
Which biological term explains this situation?

1. Motivation
2. Habituation
3. Threshold value
4. Stimulus

The sebaceous gland makes sebum. What is the function of sebum?

1. It makes the skin flexible
2. It lowers the body temperature
3. It stores energy
4. It feeds the hair and the hair follicle

In the eye you have the retina. A special place on the retina is the fovea. What is the fovea?

1. This is the place where you can't see well
2. This the place with a lot of sensory cells
3. This is the place where the optic nerve starts
4. This is the place where the eye gets blood

What is NOT a transparant part of the eye?

1. Lens
2. Cornea
3. Retina
4. Vitreous body

When you go from a place with a lot of light to a dark place, your pupil changes. What happens in this situation to your pupil?

1. Your pupil becomes smaller
2. Your pupil becomes bigger

Which receptor do you use to sense the t-shirt on your skin?

1. Pressure receptor
2. Pain receptor
3. Heat receptor
4. Touch receptor

Sarah broke her wrist and the doctor put a cast on her arm. Initially, the cast feel tight around her arm, but after a while she doesn't notice it anymore.
What has happened to the threshold value for the receptors which this cast? Explain your answer.

If you get a tattoo, the ink will be injected in the dermis, not in the epidermis. Explain why it shouldn't be in injected in the epidermis.

There a different receptors in your skin. One of them is the pressure receptor and the other one is a touch receptor. Which of those two receptors is found deeper in the skin? Explain your answer.

You see the world around you with your eyes. This is because light falls in your eyes.
Explain what happens when you see something. Use the following words: stimulus, impuls, sensory cells, retina, brain.