1. What is the meaning of the suffix -itis? Give an example of a word that contains it and explain its meaning. - The suffix -itis means inflammation. An example of a word that contains it is gastritis, which means inflammation of the stomach. 2. What is the difference between a sign and a symptom? Give an example of each. - A sign is an objective indication of a disease or condition that can be observed or measured by others, such as fever, rash, or blood pressure. A symptom is a subjective experience of a disease or condition that is reported by the patient, such as pain, nausea, or fatigue. 3. What are the four main types of tissues in the human body? Name one organ that contains each type of tissue and explain its function. - The four main types of tissues in the human body are epithelial, connective, muscle, and nervous. Epithelial tissue covers the body surfaces and lines the cavities and ducts. It also forms glands that secrete substances. An example of an organ that contains epithelial tissue is the skin, which protects the body from external agents and regulates temperature and water loss. Connective tissue supports and binds other tissues and organs. It also stores fat, produces blood cells, and fights infection. An example of an organ that contains connective tissue is the bone, which provides structure and support for the body and protects vital organs. Muscle tissue contracts and relaxes to produce movement. It also generates heat and maintains posture. An example of an organ that contains muscle tissue is the heart, which pumps blood throughout the body. Nervous tissue transmits and processes information from sensory receptors to effectors. It also coordinates and regulates body functions. An example of an organ that contains nervous tissue is the brain, which controls voluntary and involuntary actions and processes sensory input. 4. What are the three main parts of a neuron? Describe their structure and function. - The three main parts of a neuron are the cell body, the axon, and the dendrites. The cell body contains the nucleus and other organelles that maintain the cell's metabolism and produce neurotransmitters. The axon is a long, thin extension that carries electrical impulses away from the cell body to other neurons, muscles, or glands. The dendrites are