This powerpoint presentation covers Topic 6.5 in the IB Biology curriculum. Specifically it covers the basics of the nervous system, how neurons transmit impulses, synaptic transmission and the endocrine system's role in maintaining homeostasis.
Each slide is labelled with the specific learning objective and animation/video links are provided in the slide notes. The slides are formatted to print well for handouts or revision and I can provide a pdf version upon request.
As always, please let me know if you have any suggestions for improvements. These are always a work in progress!
**IB Biology Learning Objectives:
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.
6.5.2 – Draw and label a diagram of the structure of a motor neuron.
6.5.3 – State that nerve impulses are conducted from receptors to the CNS by sensory neurons, within the CNS by relay neurons, and from the CNS to effectors by motor neurons.
6.5.4 – Define resting potential and action potential (depolarization and repolarization).
6.5.5 – Explain how a nerve impulse passes along a non-myelinated neuron.
6.5.6 – Explain the principles of synaptic transmission.
6.5.7 – State that the endocrine system consists of glands that release hormones that are transported in the blood.
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.
6.5.9 – Explain that homeostasis involves monitoring levels of variables and correcting changes in levels by negative feedback mechanisms.
6.5.10 – Explain the control of body temperature, including the transfer of heat in blood and the roles of the hypothalamus, sweat glands, skin arterioles and shivering.
6.5.11 – Explain the control of glucose concentration including the roles of glucagon, insulin and alpha and beta cells in the pancreatic islets.
6.5.12 – Distinguish between type I and type II diabetes.