Which organism would have a four-chambered heart to separate oxygenated from deoxygenated blood?
1.bird
2.fish
3.frog
4.turtle
1
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Decompression sickness is caused by:
a. dissolved gases coming out of solution and forming gas bubbles. b. the concentration of hemoglobin dropping markedly. c. chloride ions precipitating from solution. d. the pH of the blood rising too rapidly. e. carbonic anhydrase being inhibited.
Mucus occurs in both the respiratory and digestive tracts. What is its main immunological function?
A) sweeping away debris B) physically trapping pathogens C) destruction of pathogens because it is acidic D) increasing oxygen absorption
The figure shows the evolution of HIV and SIV. Choose the true statements about the evolution of HIV (Select all that apply).
A. A strain of HIV is never more closely related to another strain of HIV than it is to a SIV strain. B. HIV-1 group O is more closely related to SIV-chimpanzee than SIV-gorilla. C. All strains of HIV are included within clades with SIV strains. D. All strains of SIV are included within clades with HIV strains. E. Humans acquired different subtypes of HIV from different primate hosts.
Which of the following is not a role the skeletal system plays in helping the cardiovascular system?
A. protects the brain B. protects the heart C. stores calcium for blood clotting D. regulates the contraction of the heart E. assists muscles in movement of blood in veins