Chapter 39 History for Chapter 39 Pre Class Assignment Item Chapter 39 Pre Class Assignment Score 100 Calculated Due Wednesday November 12 2014 8 00 AM Tuesday November 11 2014 12 25 AM Submitted Answers 1 If the partial pressure of oxygen pO2 in a man s blood plasma decreased below that in his red blood cells what would be the result More oxygen would diffuse into his red blood cells and be transported throughout his body Oxygen would diffuse out of his red blood cells and less oxygen would be transported throughout his body The concentration of oxygen would be the same in red blood cells and blood plasma Score 1 of 1 2 Which of the following will not pass through the phospholipid bilayer of a membrane carbon dioxide sodium ions molecular oxygen Score 1 of 1 3 The random thermal motion of molecules from a region of higher concentration to a region of lower concentration is called diffusion The rate of diffusion across a barrier is defined by Fick s law of diffusion Rate of diffusion k A C2 C1 D k diffusion coefficient which depends on solubility and temperature A surface area for exchange C2 C1 difference in partial pressure of gas on either side of the barrier D thickness of the barrier to diffusion In the design of respiratory systems 1 and 2 represent membrane barriers between the outside medium and the inside of the organism Which would have the higher rate of diffusion Respiratory Membrane 1 or Respiratory Membrane 2 Respiratory Membrane 1 Respiratory Membrane 2 Score 1 of 1 4 A man visits a doctor and discovers that due to tumors he needs to get both of his carotid bodies removed What processes will their removal affect in his body Select all correct choices His body will not be able to sense the oxygen concentration of brain bound blood His body will not be able to sense the CO2 concentration of brain bound blood His body will not be able to sense the oxygen concentration of body bound blood His body will not be able to sense the CO2 concentration of body bound blood Score 1 of 1 5 Which of the following blood vessels carry CO2 rich and oxygen poor blood back to the heart Select all correct choices venules arterioles veins arteries capillaries human frog mammal bird fish Score 1 of 1 6 Which of the following animals has a heart in which oxygenated and deoxygenated blood mix Score 1 of 1 7 The pacemaker of the mammalian heart is select all correct answer options an electrically charged region of the pulmonary vein a group of specialized cardiac fibers that initiate the heart beat modulated by signals from the nervous system a group of fibers located between the atrium and the ventricle called the AV node Score 1 of 1 8 During the phase of the cardiac cycle blood enters the ventricles and exits the ventricles during the phase systole diastole diastole systole refractory systole diastole refractory Score 1 of 1 9 Insects possess circulatory systems in which hemolymph completely bathes the organs and is not typically contained in distinct arteries or veins Score 1 of 1 10 describes the process by which molecules of a substance will move from regions of high concentration to regions of low concentration until an equilibrium is reached open closed active transport diffusion physiology homeostasis Score 1 of 1 Close
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