Solved: Which of the following respiratory systems is not closely associated with a

Which of the following respiratory systems is not closely associated with a blood supply? a. the lungs of a vertebrate b. the gills of a fish c. the tracheal system of an insect d. the skin of an earthworm e. the parapodia of a polychaete worm

Blood returning to the mammalian heart in a pulmonary vein drains first into the a. vena cava. d. left ventricle. b. left atrium. e. right ventricle. c. right atrium

Pulse is a direct measure of a. blood pressure. b. stroke volume. c. cardiac output. d. heart rate. e. breathing rate

When you hold your breath, which of the following blood gas changes first leads to the urge to breathe? a. rising O2 b. falling O2 c. rising CO2 d. falling CO2 e. rising CO2 and falling O2

If a molecule of CO2 released into the blood in your left toe is exhaled from your nose, it must pass through all of the following except a. the pulmonary vein. b. an alveolus. c. the trachea. d. the right atrium. e. the right ventricle

Compared with the interstitial fluid that bathes active muscle cells, blood reaching these cells in arteries has a a. higher PO2 . b. higher PCO2 . c. greater bicarbonate concentration. d. lower pH. e. lower osmotic pressure.

Which of the following would increase the amount of oxygen undergoing net diffusion from the lungs into the blood? a. increasing the binding of oxygen to hemoglobin b. increasing the water vapor content of air in the lungs c. increasing the partial pressure of oxygen in the blood d. decreasing the red blood cell count of the blood e. decreasing the partial pressure of oxygen in the lung

Plot blood pressure against time for one cardiac cycle in humans, drawing separate lines for the pressure in the aorta, the left ventricle, and the right ventricle. Below the time axis, add a vertical arrow pointing to the time when you expect a peak in atrial blood pressure.

The hemoglobin of a human fetus differs from adult hemoglobin. Compare the dissociation curves of the two hemoglobins in the graph at right. Propose a hypothesis to explain the benefit of this difference between these two hemoglobins

One of the many mutant opponents of the movie monster Godzilla is Mothra, a giant mothlike creature with a wingspan of several dozen meters. However, the largest known insects were Paleozoic dragonflies with half-meter wingspans. Focusing on respiration and gas exchange, explain why truly giant insects are improbable

Some athletes prepare for competition at sea level by sleeping in a tent in which PO2 is kept artificially low. When climbing very high peaks, some mountaineers breathe from bottles of pure O2. Relate these behaviors to humans physiological interactions with our gaseous environment and control mechanisms governing oxygen delivery within the body