Lesson 3 Assignment Part One

Lesson 3 Assignment Part One - impulses from the sensory...

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Part One: 1. Describe the structural differences between white and grey matter: White Matter: White matter is the part of the nervous system that is constructed of myelinated nerve fibres (axons). White matter forms the inner region of some areas of the brain, as well as the outer part of the spinal cord. Grey Matter: Grey matter is the part of the nervous system that contains mostly cell bodies, dendrites, and short unmyelinated axons. Grey matter is a brownish-grey colour, and forms the outer regions of the brain, as well as the H-shaped core of the spinal cord. 2. Explain the basic function of a neuron A neuron is the structural and functional unit of the nervous system, consisting of a nucleus, cell body, dendrites, axons, and a myelin sheath. Neurons are specialized to respond to physical and chemical stimuli, to conduct electrochemical signals, and to release chemicals that regulate various body processes.
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3. Explain the function of each neuron and trace the neural pathway. Sensory Neuron: Sensory neurons transmit
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Unformatted text preview: impulses from the sensory receptors to the interneuron. Interneuron: Interneurons are found in the brain and the spinal cord, and act as an integration centre for nerve impulses. Motor Neuron: Motor neurons conduct impulses from the interneurons to the effectors. 4. Indicate the direction of impulse transmission down the neuron The impulse transmission would travel from the sensory neurons, towards the spinal cord and the brain, and then back down to the motor neurons/ effectors. 5. Describe the functions of of the myelin sheath: The myelin sheath is a fatty, insulating layer around the axon of a nerve cell, composed of Schwaan cells. It protects neurons and speeds up the rate of nerve impulse transmissions. 6. Hypothesize how the impulse coming from the motor neuron might reach the muscle Fbre (effector): I believe that the impulse coming from the motor neuron will reach the muscle Fbre by moving down the motor neuron, and jumping from the motor end plates, onto the muscle Fbre (effector)....
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