Inside our brain‚ there is this system called the human nervous system. There are two types of nervous systems: the peripheral and central nervous systems. The peripheral nervous system includes the nerves connecting the central nervous system to the rest of the body. It has two subdivisions: somatic nervous system and autonomic nervous system. Somatic nervous system controls skeletal muscles and interacts with the external environment. An example is walking through a park. You are using your motor
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1. Describe the general structure and function of the nervous system. The Nervous System is a "network" which delivers information and monitors the processes taking place in our bodies at all times. The nervous system in all its aspects allows us to function as a single controlled and coordinated unit. The basic nerve cell nerve cell is a neuron; a chain of neurons is actually a "communication cable "inside our bodies. Neuron structure is basically the cell nucleus‚ the dendrites which receive information
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A refractory period is a period of time where the cells are resistant to depolarisation. There are 3 different refractory periods‚ firstly the absolute refractory period which is the part of the cardiac cycle where no further depolarisation can take place. Secondly it is the relative refractory period where depolarisation of the cells can occur but only if the stimulus is strong enough‚ and finally there is the diminished refractory period where the cells are still resistant to depolarisation but
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The nervous system is made up of millions of neurons and interconnected nerves that are comparable to a wiring system. The nervous system is composed of the central nervous system (CNS) and the peripheral nervous system (PNS). The nervous system functions like a corporate giant. The CEO is the leader in the CNS and the officers and delegates are the PNS. The CNS gives the commands and the PNS follows the commands. The Central Nervous System The central nervous system (CNS) is
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CELL ULTRASTRUCTURE CELL ULTRASTRUCTURE Cells are the smallest functional units of the body‚ (Waugh‚ A. and Grant‚ A.2010). Most cells are microscopic. The largest cell in the body is the female ovum. The erythrocyte is the smallest cell. The longest cell is the neuron. Cells group together to form tissues‚ each of which has specialised function. Different tissues group together to form organs. Organs are group together to form organ systems‚ each of which performs a particular function that
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Structure: The spinal cord is a white‚ soft and cord (rope) like material running through the backbone. The internal structure of the spinal cord is much simpler and more uniform throughout its many parts than that of the brain. No matter where it is sectioned‚ it gives the same general appearance. The interior of the spinal cord looks grey because it is filled with neurons without having myelin sheath in their axons. There are thirty-one pairs of peripheral spinal nerves connected to the spinal
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Lab Analysis Questions 1. What are the important ions for most neurons when considering changes in membrane potential? (3 points) 2. What is the resting membrane potential? (3 points) 3. What does it mean that the voltage just inside the membrane is negative? (4 points) Neurophysiology of Nerve Impulses Activity 2: Receptor Potential (20 points total) Notes: • After reading the Overview and Introduction‚ Click on Experiment. • Follow the directions on the left side of the
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Pharmacology: Most often used to treat mild to moderate hypertension. Mode of action: Reserpine inhibits the ATP/MG2+ pump responsible for packaging neurotransmitters into vesicles in the presynaptic neuron. This causes the free neurotransmitters to be degraded by MAO‚ leading to a reduction in catecholamines. 2. Increased neurotransmitter release into the synapse. Drug: Black Widow Venom Pharmacology: Neurotoxin. Mode of action: Alpha-latrotoxin (a-LTX) is the three-dimensional protein toxin unique
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Lecture in General Psychology The Science of Psychology Psychology is derived from the Greek words psyche and logos‚ meaning soul and study. To the Greek‚ Psychology is simply a study of the soul. Psychology is defined as the scientific study of the behavior of living organisms‚ with special attention to human behavior. It is chiefly concerned with what makes people behave as they do. Psychologists are interested in topics such as learning‚ emotion‚ intelligence‚ heredity and environment
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activated. Neurotransmitters are either antagonist or agonist. Antagonist is a chemical that blocks a cells response to an action. While the agonist is a chemical that mimics (taken from the textbook) the effects of the original neurotransmitter. All these actions take place between the brain and the nerves and happen faster than the speed of lightning. At the end of the action your arm will go up‚ your hand will open and you can now catch the ball. This is how I understood the
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