Science revision (B1, C1, P1)

Receptors 

Biology revision

The 5 senses. Touch, taste, smell, sound and smell.

Touch:

• The skin is sensitive to pressure and temperatures.

Taste:

• The tongue responds to the chemicals in food.

Smell: 

• The nose senses chemicals in the air.

Ears:

• They pick up sound waves and chemicals in the air also.

Eyes:

• The eye is sensitive to light and it is responsible for your sight.

Learn the eye with all its different parts:

• Cornea = It bends the light
• Iris = It controls how much light enters the pupil.
• Lenses focuses = Focuses light onto the retina
• The retina is light-sensitive. The retina is covered in rods and cones which allow the light to be detected.
• Rods are more sensitive to dull colours like black and brown.
• Cones are more sensitive to natural colours like yellow, green and red.
• If someone is colour blind it may be because of the lack of cone cells.
• Optic nerve = Carriers impulses from the receptors to the brain.
  

Focusing on near and distant objects:

• Eyes focus on the light by changing…