<br><br>When someone looks at an object‚ what he/she is really seeing is the light that the object reflects‚ or gives off. This reflected light passes through the lens and falls on to the retina of the eye. Here‚ the light induces nerve impulses that travel through the optic nerve to the brain‚ where it makes an image of the object‚ and then that image is passed on to muscles and glands.<br><br>The eye is well protected. It lies within a bony socket of the skull. The eyelids guard it in front. They blink
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SENSE ORGANS RECEPTORS (Sense organs) * Transducers of specific forms of kinetic energy * Change mechanical‚ electrical‚ thermal‚ chemical‚ or radiant energy into nerve impulses in sensory neurons Two major categories: * GENERAL RECEPTORS * Often exist as individual cells or receptor units * Widely distributed throughout the body * Most numerous such as: * touch‚ temperature‚ and pain: and * to initiate various reflexes necessary for maintaining
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brain is a spongy organ made up of nerve and supportive tissues. It is located in the head and is protected by a bony covering called the skull. The base‚ or lower part‚ of the brain is connected to the spinal cord. Together‚ the brain and spinal cord are known as the central nervous system (CNS). The spinal cord contains nerves that send information to and from the brain. The CNS works with the peripheral nervous system (PNS). The PNS is made up of nerves that branch out from the spinal cord
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Anesthesiologist- is a physician who specializes in anesthesiology. Auditory/Eustachian tube - is a tube that links the nasopharynx to the middle ear. Auricle-is the outer projecting portion of the ear. Also called pinna. ANS- Is the system of nerves that regulates body functions which have no direct voluntary control. Cerebrum- is the anterior and largest part of the brain‚ consisting of two halves or hemispheres and serving to control voluntary movements and coordinate mental actions. Ciliary
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scents at the point of sale to create a more enjoyable atmosphere which increases the buy-impulse. 2. Function and anatomy of the brain‚ logic of emotions‚ principles 2.1. Function and anatomy The human brain regulates and steers our bodies. All processes happening to make work certain parts of the body‚ have a biochemical or biophysical basis1. For instance: if signals wouldn´t be send through nerves to the heart to make it pump blood through the veins‚ it would simply stop beating. The central
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information from the environment so that people can function in the world. Each nerve cell in the brain communicates with some 10‚000 other nerve cells. 3. Adaptation As the world constantly changes‚ the brain and nervous system allow a person to adjust to those changes. The brain has a lot of plasticity‚ meaning it has a vast capacity for modification and change. 4. Electrochemical Transmission Electrical impulses and chemical messenger systems allow the brain and nervous system to work as an
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anatomy‚ cell biology‚ systemic anatomy‚ surface anatomy‚ regional anatomy‚ pathological anatomy‚ and imaging anatomy. Physiology is the study of how the parts work and the body’s function. Physiology also has several branches of studies which are: Neurophysiology‚ Endocrinology‚ Immunology‚ Exercise physiology‚ Cardiovascular physiology‚ Renal physiology‚ Respiratory physiology‚ and pathophysiology. (Tortora & Derrickson‚ 2014) Anatomical position is the position in which the body stands erect facing
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System of nerves that includes the brain‚ brainstem‚ and spinal cord Cell body Part of a neuron that contains a nucleus but does not incorporate the axon and dendrites Peripheral nervous system All nerves that are not part of the CNS Dendrites Short branched extension of a nerve cell that receives signals from other nerves cells. Somatic nervous system Nervous system associated with voluntary body movements‚ such as moving and arm or leg. Axon Long threat like nerve cell that sends impulses to other
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Exercise‚ for example‚ stimulates stretch receptors in the muscles. These receptors then send a signal to a part of the brain called the medulla oblongata that receives the sensory input. It then in turn sends nerve impulses to the sinoatrial node in the heart. This node generates an impulse and initiates contraction of the heart at a quicker pace. Thus‚ the heart beats faster‚ which equals an increased heart rate. This is an example of a homeostasis imbalance. The heart reaches homeostasis again
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using signal molecules called nerves which contains neurotransmitters 7. which contain which link sensory neurons to 8. which is divided into 9. 10. Copyright © by Holt‚ Rinehart and Winston. All rights reserved. Holt Biology 25 Nervous System Back Print TEACHER RESOURCE PAGE 2. Reaction times increase and coordina- and temperature‚ are carried by A fibers. Motor impulses to skeletal muscles are also carried by A fibers. These types of impulses relay information about the external
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