from 4 microns (.004 mm) to 100 microns (.1 mm) in diameter. Their length varies from a fraction of an inch to several feet. Neurons are nerve cells that transmit nerve signals to and from the brain at up to 200 mph. The neuron consists of a cell body (or soma) with branching dendrites(signal receivers) and a projection called an axon‚ which conduct the nerve signal. At the other end of the axon‚ the axon terminals transmit the electro-chemical signal across a synapse (the gap between the axon terminal
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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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cord injury is harm to any a part of the funiculus or nerves at the tip of the epithelial duct and sometimes causes permanent changes in strength‚ sensation and different body functions below the location of the injury. What happens when you have a spinal cord injury? It can cause an accident that causes your vertebrae to interrupt may also harm your neural structure. And once the neural structure is broken‚ the route is closed. Nerve impulses can’t get through. This ends up in dysfunction and loss
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Homeostasis is when the body maintains a constant balance through a series of monitored adjustments. Homeostasis must occur in animals in order for them to maintain a constant balance‚ despite the changes in the internal or external environment. Cells in animals are dependent on the internal and external environment in order for them to function. Homeostasis allows to the body to maintain a constant value in order for the cells to stay constant. An example of homeostasis is Thermoregulation. Thermoregulation
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ANIMAL ORGANIZATION AND HOMEOSTASIS QUIZ NOTE: THIS SECTION ALSO INCLUDES THE INTEGUMENTARY SYSTEM _____1. Which gives the correct sequence of increasing organizational complexity? a) organ‚ tissue‚ cell‚ organ system‚ organism b) cell‚ organ‚ organ system‚ tissue‚ organism c) cell‚ tissue‚ organ‚ organ system‚ organism d) organism‚ tissue‚ cell‚ organ system‚ organ e) tissue‚ cell‚ organ system‚ organism‚ organ _____2. Which type of tissue lines body cavities and covers body surfaces
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understand how a neuromuscular blocking agent works one must first understand the process of muscle contraction and what has to take place in order for us to be able to move our muscles. To create a muscle contraction your brain sends a message (nerve impulse) to your muscles via axon extensions. The end of this axon forms a union with a single muscle fiber; this union is called the neuromuscular junction. The axon terminal and the muscle fiber don’t actually touch at this junction; they are attached
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belief that the flow of animal spirits caused behaviors. He held a mechanistic view arrived at because of the statues of St. Germaine. Descartes thought humans followed the same pattern as the statues with water flowing through tubes‚ representing nerves and the fluid that result in muscle stimulation (Millis‚ n.d.). In 1664 Thomas Willis published Anatomy of the Brain. The publication viewed the brain’s structures as
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Question 1 Skeletal System The skeletal system is a strong yet light‚ flexible living framework that supports the body‚ protects delicate internal organs and makes movement possible. In addition‚ our bones store minerals while red bone marrow produces blood cells. Support The skeleton provides a frame that shapes the body and holds it up. Within the skeleton different characteristics of support can be identified. As the body’s main axis‚ the backbone provides support to the trunk with its upper
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Nodes of Ranvier: a gap between two of the Schwann cells that make up an axon’s myelin sheath; serves as a point for generating a nerve impulse. Resting potential: the difference in electrical charge across the plasma membrane of a neuron. Sodium-potassium pump: the mechanism that uses ATP energy to reset the sodium and potassium ions after transmission of a nerve impulse. Active transport: transport of molecules against a concentration gradient with the aid of proteins in the cell membrane and energy
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inner ear consists of the spiral-shaped cochlea (an ancient Greek word for the shell of a snail). The passageways of the cochlea are lined with about 20‚ 000 microscopic hair cells that convert sound vibrations into nerve impulses which are then sent to the brain. Here‚ these impulses are interpreted as meaningful sounds. There are only 15‚000 hair cells to perform this analysis‚ and they pass the information to the auditory
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