<p> Nervous System - Revision</p><p>1. The diagram below is of a nerve cell or neuron. </p><p> i. Add the following labels to the diagram. Axon; Myelin sheath; Cell body; Dendrites; Muscle fibers; ii. If you like, colour in the diagram as suggested below. Axon - purple; Myelin sheath - yellow; Cell body - blue; Dendrites - green; Muscle fibers – red; iii. Now indicate the direction that the nerve impulse travels. </p><p>2. There are three different kinds of neuron or nerve cell. Match each kind with its function. </p><p>A. Motor neuron; B. Sensory neuron; C. Relay neuron;</p><p>Kind of neurone Function </p><p>The nerve cell that carries impulses from a sense receptor ...... to the brain or spinal cord. </p><p>...... The nerve cell that connects sensory and motor neurons </p><p>The nerve cell that transmits impulses from the brain ...... or spinal cord to a muscle or gland 3. Match the descriptions in the table below with the terms in the list. </p><p>A. Synapse; B. Axon; C. Myelin sheath; D. Nerve impulse; E. Sense receptor; F. Response; G. Reflex; H. Cell body; I. Dendrite; J. Nerve; K. Neurotransmitter; L. Axon terminal</p><p>Term Function </p><p>...... 1. The long fibre that carries the nerve impulses. </p><p>...... 2. A bundle of axons. </p><p>...... 3. The connection between adjacent neurons. </p><p>...... 4. The chemical secreted into the gap between neurons at a synapse. </p><p>...... 5. A rapid automatic response to a stimulus. </p><p>...... 6. The covering of fatty material that speeds up the passage of nerve impulses. </p><p>7. The structure at the end of an axon that produces neurotransmitters to transmit the nerve impulse ...... across the synapse. </p><p>...... 8. The high speed signals that pass along the axons of nerve cells. </p><p>...... 9. The branching filaments that conduct nerve impulses towards the cell. </p><p>...... 10. The sense organ or cells that receive stimuli from within and outside the body. </p><p>...... 11. The reaction to a stimulus by a muscle or gland. </p><p>...... 12. The part of the nerve cell containing the nucleus. 4. The diagram below shows a cross-section of the spinal cord. Add the following labels to the diagram. </p><p>Central canal; White matter; Dorsal root; Grey matter; Ventral root; Skin; Muscle; Sensory neuron; Relay neuron; Motor neuron; Pain receptors in skin</p><p>5. </p><p> a) List in order the 3 different neurons involved in a reflex arc from the stimulus to the response. </p><p>Stimulus ...... Response 6. Indicate whether the following parts of the nervous system are part of the Central Nervous System CNS) or the Peripheral Nervous System (PNS). </p><p>Part of nervous system CNS or PNS? </p><p>Brain ...... </p><p>Autonomic nervous system ...... </p><p>Spinal nerves ...... </p><p>Spinal cord ...... </p><p>Cranial nerves ...... </p><p>10. Match the descriptions below with the parts of the nervous system in the list. You may need to use some terms more than once. </p><p>A. Autonomic nervous system; B. Central nervous system; C. Peripheral nervous system; D. Parasympathetic nervous system; E. Sympathetic nervous system </p><p>Description Part of the nervous system </p><p>1. Part of the nervous system that is composed of the brain and the spinal cord...... </p><p>2. Part of the nervous system that is composed of the cranial and spinal nerves...... </p><p>3. The part of the peripheral nervous system that regulates the activity of the heart ...... and smooth muscle. </p><p>4. The part of the autonomic nervous system that increases heart and respiratory ...... rates, increases blood flow to the skeletal muscles and dilates the pupils of the eye. </p><p>5. The part of the autonomic nervous system that increases gut activity and decreases ...... heart and respiratory rates. </p>