Section 26-1 Flashcards
Animals are _, or composed of many cells. Those cells are _, meaning that they contain a nucleus and organelles.
Multicellular
Eukaryotic
Animal cells don’t have _; they are surrounded by a cell membrane. Animals are _ because they obtain nutrients by feeding on other organisms.
Cell walls
Heterotrophs
What happens when an animal respires?
They take in oxygen and give off carbon dioxide
What is the function of a circulatory system?
They rely on diffusion to transport oxygen, nutrient molecules and waste products within the cells.
Why must all living things excrete waste products
Too much build up of ammonia and other wastes would kill the animal.
The excretion system eliminates the amount of ammonia quickly or converts it to less toxic substances from the body.
How do muscles and muscle like tissues generate force?
Stick in the muds/jet setters generate force by becoming shorter. Muscles help feed and maintain fluids through the body.
How might sexual reproduction help a species to cope with environmental change?
It helps create and maintain genetic diversity in populations.
What are some characteristics of complex animals?
Complex animals tend to have high levels of cell specialization and internal organization, body symmetry with sense organs and a body cavity.
How is the blaster of a protostome similar to that of a deurostome? How do these blastopore differ?
Protostome; an animal whose mouth is formed from the blastopore.
Deurostome; an animal whose anus is formed from the blastopore.
How do the body plans of animals with bilateral and radial symmetry differ?
Radial symmetry; which any number of imaginary planes can be drawn through the center.
Bilateral symmetry; single imaginary planes can divide the body into two equal halves.
What is the relationship between the degree of cephalization and the complexity of the animal?
Cephalization is the concentration of sense organs and nerve cells at the front end of the body.
More complex, more cephalization.
