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bio lab notes - -hypothalamus maintains homeostasis Spinal...

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Notes for bio lab quiz Nervous system -most complex system in the mammalian body both in structure and in function. -function: control and coordinate body functions and allow the organism to operate an an integrated whole. -functional unit = neuron -3 kinds of neurons: sensory, interneuron, and motor -nervous system can be divided into the CNS (brain & spinal cord) and PNS (all nerve tissue outside CNS) Brain -3 main areas: cerebellum, cerebrum, and the brain stem -Cerebrum: intelligence, memory, sensory perception *has folds (gyri) *composed of 2 hemispheres separated by the longitudinal fissure (the transwerve fissure separates the cerebrum from the cerebellum) -Cerebellum: motor activities, equilibrium -Brain Stem: breathing, circulation, reflexes -olfactory lobes: smell -optic nerves: vision -pituitary gland: secretes variety of hormones -pons: passageway for nerves running from the medulla to higher centers of the brain -corpus callosum: connects the 2 cerebral hemispheres -thalamus: regulator of sensory info to the cerebrum
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Unformatted text preview: -hypothalamus: maintains homeostasis Spinal cord-pathway for sensory impulses upward toward the brain & motor impulses down from the brain.-gray matter: cell bodies-white matter: axons and dendrites-responsible for impulses, no info is processed Eye-eye consists of a lens system and a light sensitive surface-lens system has 2 components: cornea and lens-lens focuses the light from the object to the retina (light sensitive surface) -retina: converts the image into a nerve impulse (transmitted to the brain via optic nerve)-sclera: white covering on the eye (helps maintain the shape of the eyeball)-cornea: acts as a lens to magnify the object-vitreous humor: jelly-like substance filling the main cavity-choroid: absorbs scattered rays-blind spot: where nerve fibers from the retina join the optic nerve-iris: surrounds the opening of the eye-pupil: the opening of the eye.-lens: helps focus the image on the retina-cilliary body: enables the lens to change shape...
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