electrical impulses that activate remaining retinal cells which then carry the signal back to the brain. The way it works is bionic vision system consists of a camera‚ attached to a pair of glasses‚ which transmits high-frequency radio signals to a microchip‚ implanted in the retina. Electrodes on the implanted chip convert these signals into electrical impulses to stimulate cells in the retina that connect to the optic nerve. These impulses are then passed down along the optic nerve to the vision
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Physiology of Vision Anatomy of the eye: Even though the eye is small‚ only about 1 inch in diameter‚ it serves a very important function -- the sense of sight. Vision is by far the most used of the five senses and is one of the primary means that we use to gather information from our surroundings. More than 75% of the information we receive about the world around us consists of visual information. The eye is often compared to a camera. Each gathers light and then transforms that light into a
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trend toward bilateral symmetry and cephalization * Invertebrate Nervous Organization * In simple animals‚ such as sponges‚ the most common observable response is closure of the osculum (central opening) * Hydras (cnidarians) have a nerve net that is composed of neurons * Planarians‚ (flatworms) have a ladderlike nervous system * In annelids (earthworm)‚ arthropods (crab)‚ and molluscs (squid) the nervous system shows further advances * Cephalization - concentration
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speech. The corticospinal tract originates in the cortex and travels past the pyramids located in the medulla to innervate spinal nerves through the spinal cord. The cotricospinal tract controls movement of the limbs (Rouse‚ 2015).The corticonuclear tract also originated in the cortex and travels past the pyramids located in the medulla to innervate the cranial nerves. The corticonuclear tract controls fine motor movements and controls the movement of the speech mechanisms. The corticonuclear tract
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BRAIN STRUCTURES‚ ETYMOLOGY and FUNCTIONS STRUCTURE |ETYMOLOGY|FUNCTION| Prefrontal Cortex (or Frontal Lobe) |Frontal-1650s‚ of the forehead; From Modern Latin frontalis‚ from front-‚ stem of frons "brow‚ forehead." Lobe-Early 15c.‚ "a lobe of the liver or lungs‚" from Middle French lobe and directly from Medieval Latin lobus‚ from Late Latin lobus "hull‚ husk‚ pod."|The gray matter of the anterior part of the frontal lobe that plays a role in the regulation of complex cognitive
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of the muscle ^ Tougher test and exams questions on this ^ 1.4 The muscular system: features‚ arrangement and microscopic- structure Common features of muscles Nervous control- muscle has nerve running to it from the brain (not every cell has nerves) Contractility- muscles contract and become thicker Extensibility- muscles have the capacity to stretch and extend when force is applied Elasticity- muscles can return to their original size and shape once stretched
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originate from a specific area of the ventral ventricular zone and the others arise from dorsal spinal cord. Oligodendrocytes along with Schwann cells are also responsible to generates myelin‚ the fatty white layer that preserve‚ wrap‚ and insulates nerve fibers. In the CNS‚ each oligodendrocytes able to form myelin around multiple axons whereas in the peripheral nervous system (PNS)‚ each Schwann
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Sensation: Intro Sensation is the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment. Perception is the process of organizing and interpreting sensory information enabling us to recognize meaningful objects and events. Bottom-up processing is the analysis that begins with the sense receptors and works up to the brain’s integration of sensory information. Top-down processing is information processing guided by higher-level
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Muscular System Animations 1. How do nerve impulses cause muscle contraction? Skeletal muscle is under voluntary control. Nerve impulses that originate in the central nervous system cause muscles to contract. Both neurons and muscle tissue conduct electrical current by moving ions across cellular membranes. A motor neuron ends in a synapse with a muscle fiber. The neuron releases acetylcholine and transfers the action potential to the muscle tissue. The signal will travel through the tissue
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from scattering 5- Retina- the retina is a complex structure of photoreceptors (rods and cones) on the back of the eye. The retina’s function is that photoceptors allow us to see shape‚ movement and colour and the retinal nerve cells convert incoming light into nerve impulses. 6- Iris- the iris is a coloured part of the eye and it is a ring of muscle with a hole in the middle. 7- Lens- the lens is situated behind the iris and its function is to focus light onto the light sensitive cells. The lens
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