Answer:
Platelets are not activated before an injury occurs because that activation is inhibited while they are circulating and there is no damage to the vacular wall.
Explanation:
Platelets are responsible for forming a haemostatic stopper, at the end of the blood coagulation process. These blood components have the ability to go to the place where the vessel wall is damaged and clump together to prevent blood from leaking out.
Platelet migration and activation occurs when the vascular wall endothelium is injured. When this happens, some substances are released - such as adrenaline, ADP and thromboxane A2, among others - and promote platelet activation.
<em>However, this process should not occur before an injury occurs, as it can promote the formation of thrombi that can circulate in the blood vessels and block them.</em>
<u>An inhibitory mechanism, dependent on nitric oxide and prostaglandins, prevents platelets from being activated and clumping in the absence of injury</u>.
I believe the answer is C. blood vessels.
Some of the errors that a Medical Assistant can introduce could be errors in getting patient's profile and medical history. Others can include giving of wrong advise that can put the patient in danger. To reduce errors in taking vital signs first one should make sure that the equipment to be use is working properly. There should also be precautions like when taking blood pressure, one should put the cuff 1-2 inches above the antecubital and should not be too lose or too tight to avoid false reading. For temperature, one should also compare the reading at the thermometer and touch the patient if he or she is warm or cold and for the pulse rate and respiratory rate, one should count on full minute not just 15 seconds multiply it to 4 to get a one minute.
