Both Light and Sound Have Oscillating Waves
Velocity Travels Through Vacuum? Wavelength Frequency
Light 186,000 miles/sec
Yes
400-700 nm
4 X 10^14
Sound About 700 mph
No
.02 to 20 meters
20-20,000 cycles/sec
Sound and light are waves in which the amplitude oscillates with time
For pure tones or colors the oscillation is a sine wave with a fixed wavelength and frequency
The wavelength is the distance between 2 peaks of the wave
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WHAT IS TONOMETER?
THIS PARAGRAPH HAS BEEN WRITTEN IN REFERENCE TO MDU ROHTAK EXAM PATTERN
In order to ensure a person’s optic nerves are healthy, optometrists check the pressure placed on them by the fluid in the eyes. This pressure is called intraocular pressure and should measure between 10 mmHg and 21 mmHg. Measurements that are higher than normal can be a sign of early glaucoma or retinal detachment .
BASIC CLINICAL SCIENCES Add new tag , Cornea , Glaucoma , Health , Intraocular pressure , Medical Specialties , Medicine , Ophthalmology , Optic nerve , Optometry , Retinal detachment
A Snellen chart eye chart used by eye care professionals and others to measure visual acuity . Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862
The traditional Snellen chart is printed with eleven lines of block letters. The first line consists of one very large letter, which may be one of several letters, for example E, H, N, or A. Subsequent rows have increasing numbers of letters that decrease in size. A patient taking the test covers one eye, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the patient’s visual acuity in that eye.
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Nerves Have Axons, Dendrites and Cell Bodies
Nerve cells are designed to respond to stimuli and transmit information over long distances
Nerve cell has 3 parts:
Cell body :
Has single nucleus
Has most of nerve cell metabolism, especially protein synthesis
Proteins made in cell body must be delivered to other parts of nerve
Axon:
Long cylinder, designed to transmit an electrical impulse
Can be several meters long in vertebrates (giraffe axons go from head to tip of spine)
Has axonal transport system for delivering proteins to ends of cell
HUMAN ANATOMY & PHYSIOLOGY , TUTORIALS Action potential , Add new tag , Axon , Central nervous system , Health , Neuron , Peripheral nervous system , Soma , Spinal cord , Spinal cord injury
Concentrations of Drugs in the Blood are a Balance Between Input and Output
The concentrations of all chemicals in your body are the result of a balance between input and output.
For drugs the input is usually a steady injection through an intravenous (IV) line or a periodic uptake through pills taken at regular intervals.
The output of drugs is mainly through 2 organs, the liver and kidney .
When the output equals the input a steady-state is attained and the concentration will no longer change:
This is a preview of How the Body Handles Drugs USING Kidney and Liver-INTERESTING FACT.
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The Right and Left Hearts are Connected in Series, but are Folded Together to Form a Single Unit
The right heart pumps blood only to the lungs; its output is low pressure (25 mm Hg)
The left heart pumps blood to the rest of the body; its output is high pressure (120 mm Hg)
Because the 2 hearts are attached they beat in synchrony
The 2 atria receive the incoming blood- they pump extra blood into the ventricles
