internal organs‚ monitoring information from the autonomic nervous system Basic functional cell of nervous system Transmits impulses (up to 250 mph) Parts of a Neuron Dendrite – receive stimulus and carries it impulses toward the cell body Cell Body with nucleus – nucleus & most of cytoplasm Axon – fiber which carries impulses away from cell body Schwann Cells- cells which produce myelin or fat layer in the Peripheral Nervous System Myelin sheath – dense lipid layer which insulates
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is a sheath of special‚ fiber-like cells that ties the axons of each fascicle together. Epineurium is the connective tissue that surrounds the entire nerve trunk and gives off vascular connective tissue septa that traverse the nerve and separate fascicles from one another. | | Single myelinated axon | Normal nerve | Axons thicker than one micron in the CNS and peripheral nervous system (PNS) are myelinated. Myelin is a spiral sheet of cell membrane wrapped around the axon. In the CNS‚ myelin
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THE CENTRAL NERVOUS SYSTEM Every behavior begins with biology. Our behaviors‚ as well as our thoughts and feelings‚ are produced by the actions of our brains‚ nerves‚ muscles‚ and glands. In this chapter we will begin our journey into the world of psychology by considering the biological makeup of the human being‚ including the most remarkable of human organs—the brain. We’ll consider the structure of the brain and also the methods that psychologists use to study the brain and to understand how it
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The divisions of the nervous system are the Central Nervous System (CNS) and the Peripheral Nervous System (PNS). The CNS is made of two parts the brain and the spinal cord. The PNS is made up the Somatic nervous system and the automatic system. The somatic nervous contains the peripheral nerve fibers that deliver sensory information to the CNS and motor nerve fibers that go to the skeletal muscle. The central nervous system sends messages from the brain to the rest of the body. (Divisions of The
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each) (Total: 6 marks) 16.2 Nervous coordination A. Questions 1. (a) motor neurone (1 mark) (1 mark) (b) A – cell body (1 mark) B – axon / nerve fibre (1 mark) C – myelin sheath (1 mark) (c) C is made of fat. (1 mark) It prevents the spread of nerve impulses and helps speed up the rate of transmission of nerve impulses. (1 mark) (d) X is an effector. (1 mark) e.g. muscle / gland (1 mark) (Total: 9 marks) 2. (a) Central nervous system (1 mark) (b) brain
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The Central Nervous System is composed of the brain and the spinal cord and one of it’s primary functions is to send out messsages to the rest of the body. One chronic illness that affects the Central Nervous System is Multiple Sclerosis. Roughly 2 million people througout the world have been faced with this disease‚ and “in the United States‚ it is estimated that 450‚000 people are affected‚ with 10‚000 new cases per year” (Goodman & Fuller 772). This disabiling condition has been found more prevelant
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provided below‚ complete the concept map showing the structures of the nervous system. central nervous system parasympathetic division spinal cord interneurons peripheral nervous system sympathetic division motor neurons somatic nervous system synapses neurons Nervous system consists of is divided into 1. which communicate across 2. 3. which is divided into which consists of which includes 4. 5. brain 6. autonomic nervous system using signal molecules called nerves which contains neurotransmitters
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What is the Nervous System? The nervous system is an organ system that is a network of nerves and fibers that nerve impulses between different parts of the body‚ and is responsible for sending‚ receiving and processing. All the organs and functions rely upon these nerve impulses to function. It’s an example of the body’s master control unit. The nervous system is the control and communication system of your body. its job is to send and receive messages to your body. the nervous system controls
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If you think of the brain as a central computer that controls all the functions of your body‚ then the nervous system is like a network that relays messages back and forth from it to different parts of the body. It does this via the spinal cord‚ which runs from the brain down through the back and contains threadlike nerves that branch out to every organ and body part. When a message comes into the brain from anywhere in the body‚ the brain tells the body how to react. For example‚ if you accidentally
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THE NERVOUS AND THE ENDOCRINE SYSTEM. Humans need both the Nervous and the Endocrine systems basically because they do different things in different ways. They both have a co-ordination role and send instructions to other parts of the body. The nervous system does this by way of neurotransmitters‚( chemical messengers)‚ which are able to get messages through at very high speeds‚ and the endocrine system by way of hormones‚( also chemical messengers)‚ which are released from glands and travel
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