the nervous system is divided into the CNS and the PNS. The PNS is divided into
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the nervous system is divided into the CNS and the PNS. The PNS is divided into the chwann cell Mo re than h one of these answers is correct. 3, The the nervous system is divided into the CNS and the PNS. The PNS is divided into divisions. The and the division is further divided into somatic and autonomic portions nomic nervous system innervates , whereas the somatic nervous and system innervates 4. Is a nerve an organ or a tissue? Explain. S. List the three categories of neurons based on structure: 6. List the three categories of neurons based on function: UNIT 14 Introduction to the Nervous Multiple sclerosis is an autoimmune disease that affects the brain and spinal cord. It causes dam age to the myelin surrounding nerve fibers as well as to the nerve fibers themselves. The damaged myelin forms scar tissue (a process called sclerosis), which gives the disease its name. How does 7. this disease affect nerve impulse conduction? Why 8. Does each description apply to an astrocyte (A) or to a satellite cell (S) or to both cell types (A and S)? a. Maintains proper ionic environment b. Anchors capillaries to neurons c.Found in central nervous system Does each description apply to a hormone (H) or to a neurotransmitter (N) or to both a hormone and a neurotransmitter (H and N)? 9. a. Function as chemical messengers b. Released into the bloodstream c Produced by endocrine glands 10. Does each description apply to a bipolar neuron (B) or to a unipolar neuron (U) or to both neuron types (B and U)H Classified as a sensory neuron b. Consists of one dendrite and one axon c·Found in the retina and olfactory mucosa r the ha Coc I1. Does each description apply to a graded potential (G) or to an action potential (A) or to both potential types (G and A) a. Classified as an electrical event b. Can vary in intensity c. Classified as an all-or-none event _Explanation / Answer
3. The nervous system is divided into the CNS and PNS. The PNS is divided into the somatic and autonomic divisions. The autonomic division is further divided into sympathetic and parasympathetic divisions. The autonomic nervous system innervates smooth muscle, cardiac muscle and glands, whereas the somatic nervous system innervates brain and spinal cord.
4. Nerve is a tissue found in brain, which is an organ. Nervous tissue consists of two types of cells: neurons and neuroglia. Neurons provide most of the functions of nervous system such as sensing, thinking, remembering, controlling muscle activity and regulating glandular secretions. Neuroglia supports, nourishes, and protect the neurons.
5. Three categories of neuron based on structure:
Unipolar – have single process extending from cell body, which is associated with receptors at distal end.
Bipolar- have single axon and a single dendrite
Multipolar- have 3 or more processes.
6. Three categories of neurons based on function:
Sensory neurons- conduct impulses from receptors to CNS
Motor neurons- conduct impulses from CNS to effectors
Interneurons- conduct impulses between sensory and motor neurons.
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