Describe the levels of organization in multicellular organisms and the roles of tissues and organs. Explain how organ systems cooperate for survival.

Here are the answers for the visible parts of question 8:

b) Give an example of each

Level of organization	Example
Organ	Heart
Tissue	Muscle tissue
Organ system	Digestive system
Organelle	Mitochondrion
Cell	Nerve cell

c) Explain the role of each of the following in a multicellular organism:

i) Tissue: A tissue is a group of similar cells that are specialized to perform a specific function. For example, muscle tissue contracts to produce movement.

ii) Organ: An organ is a structure composed of different types of tissues that work together to perform a more complex and vital function for the organism. For example, the stomach digests food.

d) Describe how different organ systems work together to maintain life in humans.

i. The respiratory system takes in oxygen from the environment and releases carbon dioxide.
ii. The circulatory system then transports this oxygen from the lungs to all body cells and carries carbon dioxide, a waste product, from the cells back to the lungs to be exhaled. This coordinated action ensures that cells receive the necessary oxygen for cellular respiration and waste products are efficiently removed, maintaining homeostasis.