C. increases your reaction time
Answer: Let them wear a life jacket. That way it would decrease the chance of drowning for them.
Answer: there can be two possibilities and both may work hand in hand- B.The patient's own immune system would destroy the transfused T cells before they could respond to the viral infection and
D.Donor T cell viral antigen recognition is restricted by MHC molecules not expressed in the patient.
Explanation: MHC class II are expressed on B and T cells and they will be responsible for presenting the viral peptide to T cells who will then recognize and initiate the reactions to remove viral cells.An effective immune response against viral infections depends on the activation of cytotoxic T cells that can clear infection by killing virus-infected cells. Proper activation of these T cells depends on professional antigen-presenting cells, such as dendritic cells (DCs)
Perforin first makes a pore, or hole, in the membrane of the infected cell. Cytotoxins go directly inside the cell through this pore, destroying it and any viruses inside. This is why Killer T-cells are also called Cytotoxic T-cells. The pieces of destroyed cells and viruses are then cleaned up by macrophages.
Answer:
The idea that smiling when you are not necessarily joyful can actually improve your mood, is called the facial feedback hypothesis. The first experiment to test this was performed in 1988 and involved three different subject groups holding a pencil in different ways, in their hand or in their mouth vertically or horizontally (making them smile or frown). They then viewed cartoons and recorded how funny they were. The group who was smiling found them the funniest and the group that was frowning did not appreciate them as much. Not only can smiling make you happier but you could potentially better your mood by walking in a more jovial manner. Smiling is contagious because mirror neurons which help us to empathize with others, so not only could smiling help you but also others around you. Some other benefits of smiling include: decreased stress, lowered heart rate, lowered blood pressure and longer life span.
Explanation: 100%
