Compared to homeostatic regulation by the nervous system, homeostatic regulation by the endocrine system

The homeostatic regulation prevents potentially disruptive changes in the body's internal environment.Compared to homeostatic regulation by the nervous system, homeostatic regulation by the endocrine system is slow (minutes to days). The homeostatic regulation by the nervous system on the other hand  is fast (within a second). 

The cell can't perform its activities.

Explanation:

The immediate effect of this toxin, the cell is greatly affected because mitochondria is the powerhouse of the cell which provide energy in the form of adenine tri phosphate (ATP) by the breaking down of the glucose molecule. If mitochondria does not function properly so there is no energy for the cell and the cell can't perform its activities and our body muscles will be weaker and tired very fast.