Nerves, hormones and homeostasis . Topic 6.5. Assessment Statements. 6.5.1 State that the nervous system consists of the central nervous system (CNS) and peripheral nerves, and is composed of cells called neurons that can carry rapid electrical impulses.
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6.5.8 State that homeostasis involves maintaining the internal environment between limits, including blood pH, carbon dioxide concentration, blood glucose concentration, body temperature and water balance.
6.5.11 Explain the control of blood glucose concentration, including the roles of glucagon, insulin and α and β cells in the pancreatic islets.
Peripheral nervous system (PNS) is made up of the sensory and motor neurons
Synaptic terminals of axon
Myelin sheaths made of Schwann cells
Nodes of Ranvier
When the action potential reaches the muscle (effector), the motor neuron sends a chemical signal to the muscle which results in a contraction
This binding results in an ion channel opening and sodium ions diffusion in through this channel
Neurotransmitter fragments diffuse back across the synaptic gap to be reassembled in the terminal buttons of the presynaptic neuron