2.82 Communication

Describe how responses can be controlled by nervous or by hormonal communication and understand the differences between the two systems.

1. Motor Nerve (neurone) (up to a meter long) Links our co-donator/receptor to our effector.

• has tiny branches at each end
• and a long fibre to carry the electrical implues/signals from the cell body to the Synaptic Knob (connected to the muscle) 
• in mammals, the axon is surrounded by a Schwann cell - which contain fat to increase the speed of nerve conduction. 

2. Endocrine System 

Endocrine Gland produces hormones 

• hormones can be Proteins or Steroids 
• hormones are secreted into the blood 
• they arrive at the "Target tissue/organ" 
• Hormones may have multiple targets and there for multiple effects.