Biology F214: Nerves 0.0 / 5 ? BiologyNervesA2/A-levelOCR Created by: [email protected]Created on: 13-06-16 14:31 Nervous System consists of? Central Nervous System (CNS) and Peripheral Nervous System (PNS) 1 of 30 The CNS is composed of the.. Brain and Spinal Cord 2 of 30 The PNS consists of cranial nerves attached to the Brain 3 of 30 And spinal nerves attached to the Spinal Cord 4 of 30 The Nervous System is divided into 2 functions: Voluntary and Involuntary 5 of 30 Voluntary Nervous System sends what information to the CNS? Sensory information about the surroundings 6 of 30 Involuntary Nervous System sends sensory info about what to the CNS? The internal environment 7 of 30 The involuntary nervous system controls what? Organs such as the Heart and Stomach 8 of 30 Sensory receptors are transducers meaning what? They convert one form of energy into another 9 of 30 The receptor molecules are what to those of the molecules they detect? Complementary 10 of 30 Nerve cells are specialised cells that transmit what over what distances? Electrical impulses over long distances 11 of 30 Impulses travel along Neurones (in one direction) 12 of 30 A nerve is a bundle of? Neurones 13 of 30 Surrounded by? Fibrous Tissue 14 of 30 All neurones in peripheral nerves are surrounded by what? Schwann cells 15 of 30 Schwann cells are specialised how? Insulated my myelin that acts as an insulator 16 of 30 Sensory Neurones transmit impulses from where to where? Sensory cells to the CNS 17 of 30 Motor Neurones transmit impulses from where to where? CNS to the Effectors (muscles and glands) 18 of 30 Schwann Cells are wrapped around what? Neurones 19 of 30 Each layer of Myelin consists of how many membranes? 2 membranes 20 of 30 What is sandwiched between them? Thin layer of Cytoplasm 21 of 30 Features of Sensory Neurones Sensory Dendrites -> Through Dendrons -> Cell Body -> Dendrons -> Synaptic Knob 22 of 30 What is found between dendrons? Nodes of Ranvier 23 of 30 What is the Myelin Sheath surrounding? The Axon 24 of 30 Features of Motor Neurones Dendrites -> Cell Body -> Dendrons (consisting of Myelin Sheath) -> Synaptic Knob 25 of 30 Action Potentials (Myelinated vs. NM) S: only at Nodes of Ranvier M: Along whole length 26 of 30 Conduction of Impulse (M vs. NM) S: Saltatory M: Contiguous 27 of 30 Speed of Impulse Transmission ms-1 (M vs. NM) S: 100-120 M:10-20 28 of 30 What is the role of NM in mammals? Voluntary nervous system - Skeletal Muscle contraction 29 of 30 Role of M in mammals? Involuntary nervous system - Controlling heart rate 30 of 30
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