BIO Exam 3: gas exchange and circulation

Compared to mammals that are not adapted for diving, diving mammals ____. A. can store more oxygen in their muscles B. use gills for gas exchange C. always keep blood flowing to their lungs during a dive D. have larger lungs

A

In which of the following organisms does blood flow from the pulmocutaneous circulation to the heart before circulating through the rest of the body? A. frogs B. fishes C. annelids D. insects

A

The greatest difference in the concentration of respiratory gases is found in which of the following pairs of mammalian blood vessels? A. the pulmonary vein and the superior vena cava B. the veins from the right and left legs C. the pulmonary vein and the aorta D. the pulmonary artery and the inferior vena cava

A

The only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the ____. A. fishes B. reptiles C. mammals D. amphibians

A

A decrease of blood pH from 7.4 to 7.2 causes hemoglobin to ______. A. release all bound carbon dioxide molecules B. give up more of its oxygen molecules C. bind more oxygen molecules D. decrease its binding of H+

B

In an open circulatory system, blood is ______. A. always inside of vessels and is under lower pressure than in closed circulatory systems B. not always confined to blood vessels and is under lower pressure than in closed circulatory systems C. always inside of vessels and is under higher pressure than in closed circulatory systems D. not always confined to blood vessels and is under higher pressure than inclosed circulatory systems

B

In order for blood to always flow unidirectionally through a closed circulatory system, the ____. A. capillaries must have a thick endothelium B. blood vessels farthest from the heart must have valves C. pressure in all vessels must be equal D. arteries must be elastic

B

Organisms with a circulating body fluid that is distinct from the fluid that directly surrounds the body's cells are likely to have _____. A. an open circulatory system B. branched tracheae C. a closed circulatory system D. a gastrovascular cavity

C

Circulatory systems compensate for _____. A. the need to cushion animals from trauma B. temperature differences between the lungs and the active tissue C. the problem of communication systems involving only the nervous system D. the slow rate at which diffusion occurs over large distances

D

Consider the following reaction. If the pH of the blood was decreased, then the _____. CO2+H2O--> H2CO3--> HCO3+ H A. amount of oxygen in the blood with decrease B. amount of protons in the blood with increase C. bicarbonate in the blood would increase D. amount of carbon dioxide would increase

D

During aerobic exercise, the partial pressure of oxygen in muscle cells will _____, thus the rate of diffusion of oxygen into the muscle tissue from the blood will _____. A. increase; decrease B. decrease; decrease C. not change; also not change D. decrease; increase

D