2.82

1. Motor nerve
 - coordinator - orange part on the left embedded in spine
- effector - embedded in effector (muscle)

• electrical impulse is carried inside nerve from the cell body to the synaptic knob, where it connects to the muscle
• pulse travels down long structure (axon) which can me meters long
• in mammals these cells are surrounded by schwann cells which contain fat. these schwann cells increase the speed of the nerve conduction

2. endocrine system
• endocrine glands produce hormones, in this case proteins or steroids.
• the hormone is secreted into the blood (travels through blood)
• the hormone will reach the muscle it will have an effect on, known as the target tissue/ organ
• hormones may have multiple targets and effects (nerves cant)

nerves are fast, focus on one target at a time

hormones are slow, have multiple effects on multiple targets