Put these in the order of the levels of organisation, smallest first: the heart, the person…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
- Put these in the order of the levels of organisation, smallest first: the heart, the person, cardiac muscle, a cardiac muscle cell, the circulatory system.
- Match each organ to its organ system: kidney, lung, thyroid gland, femur.
- Why does a sponge not fit the level of an organ system?
- Python lists eight organs and finds eight different systems. What does this tell you about the list?
Need a reminder? The key ideaShow
An organ is a structure made of two or more tissues that are arranged to do a particular job. The stomach, for example, has epithelial, connective, muscular and neural tissue. Organs that work together form an organ system. The levels of organisation of an animal run from cell to tissue, organ, organ system and organism. The human body is usually described as having eleven organ systems. In the wall of a hollow organ such as the intestine the layers are the mucosa, the submucosa, the muscularis and the serosa.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) A cardiac muscle cell, cardiac muscle, the heart, the circulatory system, the person.
Step 2. (b) The kidney belongs to the excretory system. The lung belongs to the respiratory system. The thyroid belongs to the endocrine system. The femur belongs to the skeletal system.
Step 3. (c) A sponge has cells that do different jobs, but it has no true tissues, and so no organs or organ systems.
Step 4. (d) Every organ in the list belongs to a different system, so the list has one organ for each system.
Answer: (a) cell, muscle tissue, heart, circulatory system, person; (b) excretory, respiratory, endocrine, skeletal; (c) no true tissues; (d) one organ for each system.
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