32-1 Introduction to Mammals

1. All mammals are characterized by what two features? ___________________________________
2. All mammals are [ endotherms / ectotherms ]
3. When did the first true mammals appear? ______________________ Period
4. How did early mammals survive during the Age of Dinosaurs? _______________________________
5. What era is known as the Age of Mammals? ____________________________________
6. What are the three major groups of surviving mammals? _____________________________________

Form and Function in Mammals

7. Endotherms are animals that can: _____________________________________________________
8. What is subcutaneous fat? ______________________________________________________
What is its purpose? ___________________________________________________________
9. What mammal does not have sweat glands? ____________________
10. The ability of mammals to regulate their body heat from within is an example of ___________________
11. Figure 32-4: Examine the jaws of the wolf and horse:
Which teeth are used for tearing and piercing? _____________________________
Which teeth are used for cutting and gnawing? ______________________________
Which teeth are used for grinding? _____________________________________
12. Compared to herbivores, carnivores have a [ longer / shorter ] digestive tract.
13. What is a rumen? _______________________________________________
What animals has one? _________________________________
14. What is inside the rumen that helps to digest cellulose? _____________________________
15. What muscle in mammals helps them to breathe more efficiently? ________________________
16. Mammals have a ______ chambered heart.
17. The ______________________________ of mammals help maintain ______________________ by filtering urea from the ______________________________.
18. In the mammalian brain, what is the function of the:
Cerebrum _____________________________________________________
Cerebellum ____________________________________________________
Medulla Oblongata ______________________________________________
19. The outer layer of the cerebrum is called the ___________________________________________
20. What two animals can find objects in their environment using echoes? ________________________
21. What is a diurnal animal? ___________________________________________________________
22. What glands release hormones? ____________________________________
23. The ___________________________ system helps protect mammals from diseases.
24. Fig 32-7: Name an animal that is a digger: _________________________________
Name an animal that is a flyer: __________________________________
What are the limbs of horses adapted for? ___________________________
25. All newborn mammals feed on __________________________
26. Name two animals that live in groups where young are cared for by many individuals:
_______________________________________
27. What system transports materials throughout the body? ________________________________
28. Bones belong to what system? _____________________________