Answer:
The immune (ih-MYOON) system attacks germs and helps keep us healthy. What Are the Parts of the Immune System? ... White blood cells, also called leukocytes (LOO-kuh-sytes), play an important role in the immune ... That way, if the immune system encounters that antigen again, the antibodies are ready to do their job
Explanation:
The immune system fights off the pathogen by Leukocytes also known as white blood cells. When a pathogen enters the body the immune system becomes alert to it and sends out sends out the Phagocytes (a type of Leukocytes) which engulfs the pathogens.
What Is a Sprain?
A sprain is caused by stretching or tearing a ligament, or the connective tissue between bones. Ligaments help support your 360 joints, enabling you to move your elbows, knees, hips, and other parts of the body.
Sprains can be mild, moderate, or severe, but symptoms of all three types of sprains commonly include:
Bruising
Inflammation
Pain
Swelling
Sprains can be caused by direct or indirect trauma to a joint, such as a fall or a hit. You will typically feel a pop or tear in the joint when a sprain occurs. A severe sprain can immediately cause extreme pain because the ligament tears completely, making the joint nonfunctional. Moderate sprains are partial ligament tears that create unstable joints. A mild sprain stretches the ligament, which does not loosen the joint.
What Is a Strain?
Strains are injuries of your muscles or your tendons, which connect muscles to bone. Typically caused by overuse of muscles and tendons, symptoms of strains can include:
Cramping
Inflammation
Muscle spasm
Muscle weakness
Pain
Swelling
Severe strains can cause your muscle and/or tendon to be partially or completely torn, leading to debilitation. Moderate strains can partially affect muscle function since the muscle or tendon is likely only slightly torn. If you have a mild strain, your muscle or tendon is slightly stretched, not torn.
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