Which of the following are the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart?
Why is gas exchange more difficult for aquatic animals with gills than for terrestrial animals with lungs?
Water contains much less O2 that air per unit volume
Which of the following animals is incorrectly paired with its feeding mechanism?
To leave the digestive tract, a substance must cross a cell membrane. During which stage of food processing does this take place?
How is most of the carbon dioxide transported by the blood in humans?
bicarbonate ions in the plasma
Which of the following featyres do all gas exchange systems have in common?
The exchange surfaces are moist
Which of the following describes peristalsis in the digestive system?
smooth muscles contractions that move food through the alimentary canal
To adjust blood pressure independently in the capillaries of the gas-exchange surface and in the capillaries of the general body circulation, an organism would need a
Which of the following respiratory systems is not closely associated with a blood supply?
The tracheal system of an insect
Which of the following reactions prevails in red blood cells traveling through alveolar capillaries? (Hb= hemoglobin)
Hb + 4 O2 = Hb(O2)4
atmospheric pressure at sea level is equal to a column of 760 mmHg. Oxygen makes up 21% of the atmosphere by volume. What is the partial pressure of oxygen (PO2)?
Which of the following hormone actions will occur when more energy is required by a human?
Blood glucagon increases
Where are the semilunar valves to be found in the mammalian heart?
At the places where blood leaves via the aorta and pulmonary arteries
Which of the following is an advantage of a complete digestive system over a gastrovascular cavity?
Specialized regions are possible
Which structure is home to bacteria that produces vitamins as by-products of their metabolism?
#5 (AKA- Large intestine)
How does the digestion and absorption of fat differ from that of carbohydrates?
Most absorbed fat first enters the lymphatic system, whereas carbohydrates directly enter the blood
Which of the following is correct for a blood pressure reading of 130/80?
I. The systolic pressure is 130
II. The diastolic pressure is 80
III. The blood pressure during heart contraction is 80
I and II only.
When more nergy sources areneeded than are generated by diet, in which order does the animal draw on stored sources?
liver glycogen, muscle glycogen, fat
A blood vessel has the following characteristics: outer layer of connective tissue, a thick layer of smooth muscle with elastic fibers, no valves. It is which of the following?
Which of the following organs is INCORRECTLY paired with its function?
large intestine-bile production