Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz (20,000 hertz) in healthy young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz. ultrasound is a safe and painless test that uses sound waves to make images of the abdomen (belly).
During the examination, an ultrasound machine sends sound waves into the abdominal area and images are recorded on a computer. The black-and-white images show the internal structures of the abdomen, such as the appendix, intestines, liver, gall bladder, pancreas, spleen, kidneys, and urinary bladder. The gel is applied to the scan area, before contacting the ultrasound probe to your Ultrasonic waves generated from the probe are reflected from the boundary of the tissue, and the probe receive reflected waves to make an ultrasound image. However, the larger the difference in acoustic characteristics between the two tissues, the stronger the reflection and the stronger the echo (white on the screen) appears. The acoustic properties (resistance) of each tissue are related to their density, which is greater in order of bone> soft tissue> fat> air. Therefore, if you apply ultrasonic probe without gel, 99.9% of ultrasonic waves are reflected at the boundary of air - soft tissue (body). Ultrasound image should show the difference between the tissues in body (normal-lesion, etc.), not the difference between the air and body.
To solve this situation, the gel is used. In other words, when the acoustic resistance of the two media is made equal by using gel, ultrasonic waves are transmitted to body without reflection.
The other purpose of the gel is the role of lubrication, which moves the probe smoothly when performing a ultrasound scan. If the gel is not used, it may be stiff and the patient may feel pain.
An ultrasound scan uses high-frequency sound waves to make an image of a person's internal body structures. Doctors commonly use ultrasound to study a developing fetus (unborn baby), a person's abdominal and pelvic organs, muscles and tendons, or their heart and blood vessels. The ultrasound sound waves have a hard time traveling through air, so the gel prevents any extra air space between the probe and your skin in order to create a clear image of the fetus.
MHC Receptors are the Major Histocompatibility Complex (MHC) are a set of proteins that are essential for the recognition of what molecules belong to the organism, and which ones are foreign. There are 3 classes of MHC receptors. It is an essential component of the acquired immune system.
The statement 'the first thing that a medical assistant should do when realizing he or she has made an error in patient care is to admit the error to his or her supervisor and the physician' is true.
A medical assistant works to take care of a patient in every way possible. As a healthcare worker, one needs to be responsible as a little mistake can cause serious, life threatening complications for a patient.
As a medical assistant, when you realize that you have made an error, it is your primary responsibility to confess the mistake to the supervisor or physician as soon as possible. The risk of not talking about the error to anybody can be life threating to patient. A supervisor or physician might have a better solution to the error and hence can help in amending the situation.
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B. Its two branches, innate and adaptive, are isolated from each other.
Explanation:
The innate and adaptive immune branches are interlinked by antigen presentation and secretion of cytokines that are secreted in response to offence. For example, IFN-gamma which is released by the innate immune activates the adaptive immune.
