Search over 10,000 free study notes

The biggest difference between the two is that the nervous system uses electrical impulses to send signals through neurones, whereas the hormonal system uses chemical messengers transported into blood plasma...

Homeostasis is the maintenance of the internal environment to a constant state, despite changes to the external environment. Examples of conditions in the body which must be kept constant include body temper...

Macrophages are simply monocytes that reside in tissues, rather than blood. In histology, monocytes appear bean shaped, whereas macrophages are just large with fluffy edges.

At its most basic, the TCA cycle is a mechanism which converts the fuel we consume - carbohydrates, fats and proteins - into special molecules called "reduced cofactors" which transport electrons t...

Promoters switch genes on, if a gene is inserted into a bacterium it needs a promoter added to coordinate with the gene for the chanracteristic to be expressed. For human insulin production in bacteria: 1) G...