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Topic 6.5 nerves, hormones & homeostasis assessment statements part i

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Information about Topic 6.5 nerves, hormones & homeostasis assessment statements part i
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Published on January 22, 2014

Author: dabagus

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Topic 6.5 nerves, hormones, & homeostasis assessment statements part 1
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I-Shou International School IB Biology 6.5 Nerves, Hormones, & Homeostasis Assessment Statements (Part I- Nerves) 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. Define the following terms, Describe their function, and state their major parts. Definition Function Parts Central Nervous System (CNS) Peripheral Nerves Neurons Complete the graphic organizer with the terms somatic nervous system, central nervous system (cns), automatic nervous system, peripheral nervous system (pns). (from www.click4biology.info) 1

I-Shou International School IB Biology 6.5.2 Draw and label a diagram of the structure of a motor neuron. (Diagram from http://neuro.psyc.memphis.edu/1200/neuroscience/neuron01.html) Part of motor neuron Function 1) Contains nucleus and most organelles 2) Receive information from other neurons 3) Conducts nerve impulses away from cell body 4) Provides electrical insulation 5) Synapse (touch & communicate) with a target cell 6) Gaps where the axon is not covered with myelin 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. Outline the role of each in the transmission of nerve impulses. Sensory Neurons Relay Neurons Motor Neurons 2

I-Shou International School IB Biology Beginning with a stimuli, outline the path of a neural signal until a response is given. 6.5.4 Define resting potential and action potential (depolarization and repolarization). Neurons can exist in different states, depending on whether they are transmitting a signal or not. Define the following terms. Resting potential Action potential Depolarization Repolarization 6.5.5 Explain how a nerve impulse passes along a non-myelinated neuron. Review passive diffusion, facilitated diffusion, and active transport. State the ions of the following elements. Potassium (K): Sodium (Na): Ion pumps preserve a concentration gradient between the interior of a neuron and its surroundings. Outline how this is done. Explain how a nerve impulse passes along a non-myelinated neuron. 3

I-Shou International School IB Biology 6.5.6 Explain the principles of synaptic transmission. Define synapse: Define neurotransmitter: Define neuroreceiver: Differentiate between pre-synaptic neuron and post-synaptic neuron. Pre-synaptic Neuron Post-synaptic Neuron Draw a synapse. Label your drawing with the terms synaptic cleft, voltage-gated ion channels, axon of pre-synaptic neuron, dendrite of post-synaptic neuron, & neuroreceptor gated ion channels. Explain how a nerve impulse is transmitted from one neuron to another neuron. 4

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