An animal digestive tract that consist of two openeings (a mouth and anus) is called
the alimentary canal
Evolutionary movement of aquatic vertebrates to land involved an intermediate individual that
had both gills and lungs
Multipotent stem cells found in the red marrow inside bones
can differentiate into all blood cells and paletets
As blood moves away from the heart towards thw tissue, the relative size of blood vessels ___, the blood pressure ____, and the velocity of blood flow ______.
An organ represents a higher level of structure than the tissue composing it and performs functions that the tissue cannot perform alone. This is an ecample of the principle eof
Geckos are able to walk up walls and across ceilings because of
the many hairs on their toes that form bonds with the walls and ceiling surface
Although birds and mammals descended from the different ancestors, they both have a four-chambered heart. This is a result of
The location of the heartss pacemaked is a specialized region of cardia muscle called the
Structure in the living world is organized into heirarchical levels. Which of the following lists these from least inclusive to most inclusive?
molecule, cell, tissue, organ, organ system, organism.
Imagine an invertebrate that lives in an estuary where salinity varies cyclically with the tides. If this individual is able to adjust the salt concentration of its body fluids, its salt concentration will have
slight fluctuations that are kept within a narrow range
The organization of blood and water flow in a fish's gills increases the fish's ability to
extract exygen from the water
When you hold your breath, which of the following blood gas changes lead initially to the urgr to breathe?
rising carbon dioxide concentration
Tuna, sharks, and penguins have adapted to their environment by becoming fast swimmers. They are fast swimmers due to the convergent evolution of
their streamlined, tapered bodies.
Which of the following mechanisms helps to prevent the gastric juice from destroying the stomach lining?
generation through mitosis of new cells to replace the stomach lining
Interestingly, most herbivorous animals do not have the ability to digest the cellulose in plants. However, in the absence of this ability, they have evolved a mechanism that allows them to
survive despite eating only plant matter, namely
digestion by symbiotic microorganisms
Which of the following factors contributes to the flow of blood in veins?
skeletal muscle contractions
What is the main digestive function of the pancreas?
to produce digestive enzymes and alkaline solution
Oxygen moves from blood into the interstitial fluid and then to body cells because
it diffuses from a region of higher partial pressure to a region of lower partial pressure
Digestion takes place in specialized compartments for all of the following reasons except that
the environment of digestion must protect the food.
Connective tissue is different from the other major tissue typed in that
the cell are sparself scattered through a nonliving matix
In mammals, blood returning from the head will pass through the ____ just before entering the right atrium.
superior vena cava
Which of the following statement regarding animals is false?
Animals that extract food particles suspended in the surrounding water are called fluid feeders