Homeostasis The conditions inside our body must be very carefully controlled if the body is to function effectively. Homeostasis is the maintenance of a constant internal environment. The nervous system and hormones are responsible for this. One example of homeostasis is the concentration of carbon dioxide in the blood being carefully controlled. Here are some of the other internal conditions that are regulated: Body temperature This is controlled to maintain the temperature at which the
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helps the body communicate external environmental factors via electrical impulses that are transmitted through cells called neurons. These neurons can be up to a meter long and target a specific effector which it will help
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System: Pathways • Afferent Nerves • Also called sensory nerves‚ they carry information about the environment to brain and spinal cord • Efferent Nerves • Also called motor nerves‚ they carry information from the brain and spinal cord to the rest of the body • Neural Networks • Networks of cells that integrate sensory input and motor output Nervous System: Primary Divisions • Central Nervous System (CNS) • Brain and spinal Cord • Peripheral Nervous System (PNS) • Network of nerves connecting CNS to body
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Senses What are the human senses and how do they work? The human senses are faculties by which the human body perceives external stimulation. Humans have senses to help them experience the world around them. The five main senses are sight‚ hearing‚ taste‚ smell and touch. Each of these five senses consists of organs with a specialized structure that has receptors for specific stimulation. These receptors are linked to the nervous system and therefore the brain. Sight Sight is the sense
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along nerves. These signals prompt the changes in function that adjust the deviation and bring the internal environment back to the stable state. Next in the negative feedback loop is the effectors which are muscles‚ organs‚ or other structures that receive signals from the brain or control centre. When an effector receives a signal from the brain‚ it changes its function in order to correct the deviation (Science.jrank.org‚ 2008). To highlight‚ the nervous system uses sensory receptors‚ nerves‚ and
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Lidocaine is also used to relieve itching‚ burning and pain from skin irritation and inflammation. It works by blocking the pain signals sent by the nerve endings on the skin‚ changes signal conduction in neurons by blocking sodium channels. ~Morphine is a very potent drug that is used to relieve severe pain. It can relieve pain by silencing nerves in the spine that produce pain signals‚ morphine also has complex effects in the brain. Morphine can also be very addiction. ~Ketamine is an injection
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draws more fluid in whereas a decrease in electrolytes promotes an efflux of fluids. Sustaining this type of osmotic gradient is essential for nerve and muscle function‚ hydration‚ and maintaining blood pH levels. Additionally‚ electrolytes carry electrical impulses across the cell and to neighbouring cells in order to promote muscle contractions and nerve impulses. 1. The pH of the tissues and the entire body fluids affects the condition of your health. The closer the pH is always to 7.35 - 7.45‚ the
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longer there and has no functioning nerves. * Sensation – the process of receiving‚ converting‚ and transmitting information from the external and internal world to the brain. Major Concepts www.currentnursing.com * The three systems located in the spinal cord act to influence perception of pain‚ viz; * the substantia gelatinosa in the dorsal horn‚ * the dorsal column fibers‚ and * the central transmission cells. * The noxious impulses are influenced by a “gating mechanism
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Two of the most important sensory systems in human body are optical system and auditory system. Optical system or sometime called visual system involved in the process of taken amount of stimuli and transfer it into some figure that we can perceive as images that make senses. Auditory systems involved in sound wave that transduced by drum ear into some kind of vibration that eventually gets converted back into wave what we perceive as noise. There are a lot of similarities in their mechanisms of
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corresponding response message travel There are five parts to a reflex arc: 1.) The Receptor‚ which receives the initial stimulus 2.) The Sensory (afferent) Nerve‚ which carries the impulse to the spinal cord or brain 3.) The Intermediate Nerve Fibre (the adjustor or interneuron)‚ which interprets the signal and issues a response 4.) The Motor (efferent) Nerve‚ which then carries the response message from the spinal cord to the muscle or organ 5.) The Effector Organ itself‚ which carries out the response
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