Being a senior doesn’t equal a sedentary life. So, you want to improve the activity level in your mother or father’s life? Perhaps you’ve recently retired from your 25 years as the vice president of your company and at last have the time to devote to a running or rock climbing group.
Your immune system helps protect your body from foreign or harmful substances. Examples are bacteria, viruses, toxins, cancer cells, and blood or tissues from another person. The immune system makes cells and something call antibodies that destroy these harmful substances.