A.   positive feedback 

B.   hibernation

C.   negative feedback

D.   hypothermia

E.   the lowering of a set point

A.   the ability to maintain an absolutely constant internal body state

B.   the varying of the body state within a narrow range

C.   the ability to maintain the internal body state within a narrow range 

D.   the constant state of the body

E.   . the ability to produce heat and maintain an internal temperature.

A.   serve as a buffer

B.   be converted into starch

C.   be broken down into simple sugars

D.   be stored temporarily as glycogen 

E.   be converted into fructose and linked together

A.   a nucleotide.

B.   a protein. 

C.   a  lipid.

D.   a carbohydrate.

A.   veins.

B.   ventricles. 

C.   arteries.

D.   lungs.

A.   Humans do not need as much oxygen as small organisms do, so we use inefficient transport systems like the circulatory system rather than diffusion.

B.   Diffusion is very slow over all but the shortest distances, so oxygen must be delivered to our cells to speed up the process

C.   Diffusion does not occur in organisms that have more than about 300 cells 

D.   Humans need an internal transport system in order to quickly replace oxygen that is lost because of our high surface area of skin

A.   bronchi.

B.   alveoli. 

C.   trachea.

D.   pharynx.

A.   Carbon dioxide is moved by active transport from the lungs to the deoxygenated (“used”) blood in the capillary beds, and oxygen diffuses from the blood to the alveoli.

B.   Oxygen is moved by active transport from the lungs to the deoxygenated (“used”) blood in the capillary beds, and carbon dioxide is moved by active transport from the blood to the alveoli. 

C.   Carbon dioxide diffuses from the air into the deoxygenated (“used”) blood in the capillary beds, and oxygen diffuses from the blood to the alveoli.

D.   Oxygen is moved by active transport from the lungs to the deoxygenated (“used”) blood in the capillary beds, and carbon dioxide diffuses from the blood to the alveoli.

E.   Oxygen diffuses from the air into the deoxygenated (“used”) blood in the capillary beds, and carbon dioxide diffuses from that blood to the alveoli.

A.   the trachea 

B.   the alveoli

C.   the tracheoles

D.   the bronchioles

A.   contains less energy than kinetic energy.

B.   is kinetic energy that has not yet been turned to heat.

C.   is contained in matter placed in certain positions or arrangements. 

D.   transfers motion to matter.

E.   is stored energy unavailable to do work.

A.   The exit of the digestive system, known as the urinary tract, is needed to get rid of liquids you don't digest.

B.   Digestion increases the volume of food that initially enters the body.

C.   You always eat more food than you need.

D.   Not all that you ingest is digested and absorbed, this “leftover” must be eliminated. 

E.   None of the above are correct.

A.   We must process nutrients in order to absorb them. 

B.   We are able to directly absorb most large nutrient molecules such as starch.

C.   The absorptive surface of our gut lets all materials pass through it into the bloodstream.

D.   The human gut is able to absorb complex proteins easily.

A.   prepare undigested material and waste for disposal.

B.   carry food to the stomach. 

C.   break down food chemically.

D.   break down food physically.

A.   stomach

B.   pancreas

C.   salivary glands

D.   liver 

A.   glycolysis, oxidation, and the Calvin cycle reactions 

B.   substrate inhibition, catabolism, and fermentation

C.   hydrolysis, active transport, and the light reactions

D.   glycolysis, the reactions on the electron transport chain, and the Krebs (citric acid) cycle

E.   None of the above is correct.