Body Organization - 2

​An organ system is a group of organs that work together, performing major functions for the body. This pathway contains several organs that make up the organ system. Cells contain organelles are specialize to perform their function, so A is not correct. An organ is a body structure composed of different kinds of tissue that work together. Each organ has a specific function in the body, so B is not correct. Tissues are groups of cells that perform the same function, so D is not correct.

​Functions of the respiratory system:

​

• Allows you to talk and to smell.

• Warms air to match your body temperature and moisturizes it to the humidity level your body needs.

• Delivers oxygen to the cells in your body.

• Removes waste gases, including carbon dioxide, from the body when you exhale.

​Functions of the muscular system:

​1. Movement

• Skeletal muscles pull on the bones causing movements at the joints.

• Skeletal muscles pull on the soft tissues of the face causing facial expressions.

• Movement caused by the respiratory muscles enables breathing.

2. Support

• Muscles of the body wall support the internal organs.

• As these muscles lose their tone, the internal organs of the abdominal-pelvic cavity may bulge outward as seen in some individuals as they age.

3. Protection

• Skeletal muscles, particularly of e body wall, cushion the body's internal organs (abdominal cavity) from force applied to the exterior of the body. 

4. Heat generation

• Heat is a waste product of muscle metabolism, which helps maintain an internal body temperature of 98.6 F.

• Shivering is a mechanism of the muscular system that generates heat to warm an overly cooled body

The nervous system is comprised of the brain, spinal cord, and nerves. The brain controls our emotions, judgement, and memory. ​