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Description
Flashcards by Mrs. Reema Al Bitar, updated more than 1 year ago
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Created by Mrs. Reema Al Bitar
over 9 years ago
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| Question | Answer |
| Cells | Each type of specialized cell has a particular structure and a chemical makeup that enable it to perform a specific task. Some cells in the lungs, for instance, are involved in the exchange of gases. Others secrete mucus that helps to trap foreign particles and to protect the lungs from pathogens, such as bacteria and viruses. |
| Tissue | Groups of similar cells that work together to perform a specialized function are known as tissues. The human body is made up of four general types of tissues. |
| Epithelial tissue | Consists of protective sheets of tightly packed cells connected by special junctions. The skin and the membranes that line the stomach, the lungs, and other organs are epithelial tissues. |
| Connective tissue | Serves to support, bind together, and protect other tissues and organs. Tendons, ligaments, bone, and cartilage are all connective tissues. |
| Muscle tissue | Is capable of contracting to produce movement. The human body contains skeletal, cardiac, and smooth muscle tissues. |
| Nervous tissue | Transmits and receives impulses in response to stimuli, processes information, and regulates the body’s response to its environment. |
| Organ | Different types of tissue that function together form an organ. For example, the lungs are organs composed of all four types of tissues. Muscle and connective tissues expand and contract the lungs. Nervous tissue sends and receives messages that help regulate gas exchange in the lungs and the rate at which a person breathes. Epithelial tissue forms the inner lining of the lungs. |
| Organ Systems | Two or more organs working in a coordinated way form an organ system. Organ systems perform the most complex activities in the body. |
| Organism | Together, the organ systems make up the entire organism. For you or any other organism to stay alive, all of the systems must interact and work together. |
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