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.
Some gerontologic changes the nurse should take care of while assessing the older adult patient are c. Decreased gag reflex, d. The increased presence of collagen in alveolar walls, e. Decreased presence of mucus. So our correct options are Options c, d, and e.
Gerontology is the scientific study of old age, the ageing process, and the unique issues that older people face.
Gerontology's goal is to improve the quality of life by reducing the effects of age-related illnesses and ailments, not prolonging them. The special requirements of older persons, which vary depending on a person's ethnicity, gender, and health, are promoted by gerontologists.
A nursing profession grounded in scientific evidence, gerontological nursing attends to the distinct physiologic, social, psychological, developmental, economic, cultural, spiritual, and advocacy requirements of senior citizens.
Excessive amount of sugar and oily dietary restrictions was followed by her in the condition of hypertension and diabetes.
Hypertension : A condition in which the force of the blood against the artery walls is too high.
Usually hypertension is defined as blood pressure above 140/90, and is considered severe if the pressure is above 180/120.
Diabetes : a disease in which the body’s ability to produce or respond to the hormone insulin is impaired, resulting in abnormal metabolism of carbohydrates and elevated levels of glucose in the blood and urine.
The correct answer is A. The blood vessels of the renal medulla that run alongside the nephron loops are the vasa recta.
Explanation:
In anatomy, the descending vasa recta or descending straight vessel is an artery of the renal tissue, originating from the efferent arterioles, arched artery, and interlobar artery. They are so named because they follow a straight and descending trajectory from the cortex to the deepest portions of the renal medulla.
