Search over 10,000 free study notes

1. Sodium (voltage-gated) channels open and Na⁺ diffuse into neuron (down concentration gradient).

2. Inside of neuron becomes positive compared to the outside, so potential is...

Inhalation is the process of breathing air into the lungs through the nose and mouth. This causes an increase in the volume of air in the lungs, meaning the pressure will decrease. This is acheived usi...

Leaves have 4 main adaptations which enable them to carry out photosynthesis successfully. 

1) Thin - this allows carbon dioxide to easily diffuse into the leaf cells 

2) Tr...

Homeostasis is the process of maintaining a constant internal environment in the body.

An example of this is maintaining the temperature of the body. Human body temperature must be mainta...

1. What is ‘survival of the fittest’?

- ‘Survival of the fittest’ is a phrase way to describe the principle behind the theory of evolution by natural sel...