Question

1. in what ways do single - celled organisms maintain homeostasis?
2. what are two ways the cells of multicellular organisms enable the organism to maintain homeostasis?

critical thinking

1. construct an argument give three reasons supported by the text that “specialization and interdependence” could be considered the keys to homeostasis in a multicellular organism.
2. sep evaluate a model review figure 8 - 23. how well does the diagram represent the levels of organization of multicellular organisms? how could the model be improved?

Explanation:

1. Single - celled organisms maintain homeostasis through processes like diffusion for gas exchange, active transport for nutrient uptake and waste removal, and regulation of internal osmotic balance.
2. In multicellular organisms, cells communicate via chemical signals (e.g., hormones) and work together in tissues and organs. For example, cells in the pancreas secrete insulin to regulate blood - glucose levels, and cells in the kidneys regulate water and salt balance.
3. Specialization means cells have specific functions. For example, red blood cells carry oxygen, enabling efficient oxygen delivery. Interdependence means different cell types rely on each other. For instance, muscle cells need oxygen from red blood cells to function. Also, specialized cells in the immune system protect other cells, and all cells depend on the circulatory system for nutrient and waste transport.
4. Without seeing Figure 8 - 23, in general, a good model of multicellular organism organization should clearly show the hierarchy from cells to tissues, organs, and organ systems. It could be improved by adding labels for key components, showing the relationships between different levels more clearly, and including examples of each level.

Answer:

1. Through diffusion, active transport, and osmotic balance regulation.
2. Chemical communication and coordinated tissue/organ function.
3. Efficient function due to specialization, reliance of cells on each other, and protection and support among cell types.
4. Without seeing the figure, a good model shows hierarchy clearly; improvements could include better labeling and clearer relationships.