Measles

-
http://samedical.blogspot.com
   
        

Comments

Post a Comment

Popular posts from this blog

The Nervous System, the Cerebrum

-
Image
Cerebral Cortex Basal Ganglia Limbic System Cingulate Gyrus Thalamus Hippocampus Amygdala Brain function Ability to generate information and output signals in the absence of external input. Three systems that influence output by motor systems: the sensory system monitors internal and external environments and initiates reflex responses a cognitive system voluntary responses a behavioural state system sleep-wake cycles and intrinsic behaviours The Cerebral cortex is organised into functional areas There are three functional specialisations: Sensory areas - sensory inputs Motor areas - direct muscle movement Association areas - integrate sensory and motor input and direct voluntary behavious Cerebral lateralization of function or left-right brain dominance. Neurons display a level of plasticity.  Sensory information is Integrated in the Spinal Cord and Brain Primary Somatic Sensory Cortex touch, temperature, pain, itch, and body position Visual Cortex...
Read more

The Nervous System, The Sense of Hearing

-
Image
The Tympanic Membrane and the Ossicular System Sound from the tympanic Membrane to the Cochlea Tympanic Membrane, Malleus, Incus, Stapes, Oval Window - the ossicular chain. Malleus is also attached to the tensor tympani muscle. Impedance matching between sound waves in air and sound waves in the cochlear fluid is mediated by the ossicular chain. Sound is not amplified by increasing movement at the stapes, but increasing force of movement  at the stapes. Increasing pressure, increases the vibration of the fluid in the membranous labyrinth - via the oval window.  Impedance matching between air waves and fluid waves.  Contraction of the stapedius and the tensor tympani muscles attenuates sound conduction This is the same mechanism used to diminish the sensitivity to ones own speech Increases the rigidity of the stapes, and therefore the ossicular chain. Sound Transmission Through Bone Conduction The cochlea is embedded in bone, vibration of the ...
Read more

The Cardiovascular system, Heart Muscle, The Heart as a pump

-
Image
The Cardiovascular System is a  closed system , with a  one way circuit. efficiency Transports Materials throughout the body: Exogenous Endogenous Waste and heat elimination Brain is Oxygen dependent Cannot meed oxygen needs by using the anaerobic pathway 2 ATP + 1 NADH Must use the aerobic pathway - Glycolysis, Citric Acid cycle + Electron Transport System 6H2O+ 30 ATP + 6CO2 Nutrient, Hormone, Immunity transport CO2 and metabolic waste and heat removal How Blood flows: Down a pressure Gradient (dP) from high pressure to a low pressure Pressure, Volume, Flow and Resistance Pressure of a fluid in motion decreases over distance Hydrostatic Pressure: = may also be referred to as the hydraulic pressure - as fluid is in motion In a system that flows, pressure falls over distance as energy is lost to resistance / friction Pressure in Liquid changes without changes in Volume Driving pressure - the pressure of the ventricles on the systemic circulatio...
Read more