Lab 5 Flashcards
(31 cards)
What is an advantage of being an ectotherm?
Energy does not need to be used in order to create heat, so a lot less energy is used
What is the disadvantage of being a ectotherm?
Are dependant on their environment so can only live in a few specific environments and survive
How do lizards, snakes, crocs, and turtles raise their temperature if they are too cold?
Move towards a heat a source ie. Move into the sun, or near a hot space
Common representatives of birds/aves are?
Crow, turkey, goose
What feature is key to a bird skull?
Elongated skull, with beak
What is missing in a birds jaw?
Teeth
What is the function of down?
Down is used for thermal insulation and cushioning
What is contour used for?
They are stiff, so they contribute to the aerodynamic shape of the wings
What is filoplume used for?
For decoration or for sensory
Birds are different from most reptiles why?
Their endotherms, NOT ectotherms
What is an advantage of being an endotherm?
Are not dependant on their external environment for heat, so this allows them to be able to live and survive in a greater number of places
What is a disadvantage of being endotherm?
Energy must be used to create heat, so a lot of energy is used
Common representatives of mammals are..?
Beaver, skunk, pig, humans, monkeys
Define heterodonts
Several types of teeth that are physically different from and are used for various functions
Define homodonts?
Teeth are similar in appearance throughout and all have the same function
Which teeth are the incisors? (Front, side,back)
The front teeth are the incisors
Which teeth are the canines? (Front,beside,back)
The canines are the are beside the incisors
Which teeth are the molars? (front,side,back)
The back teeth
What are the molars in herbivores like?
The molars in herbivores are wide with sharp ridges and are parallel to the jaw bone, it is used for grinding grass
What are the molars in omnivores like?
Wide, with top surface rounded for crushing and pulping food
What are the molars of carnivores like?
In carnivores the molars are slender and triangle shaped, and slide past each other in order to shred food
How are the molars in rats slightly different than other herbivores?
The top of the molar is flat, with ridges perpendicular to the jaw for backward/forward chewing
Most mammals have heterodonts, but what kind of dentition dolphins have?
Dolphins have homodonts, that are conical shaped that are used only to trap prey, since they swallow their prey whole
What is the function of the arrector pilli muscles?
To raise the hairs on the body to appear larger to predators, or to trap warm air
