How does the structure of the cardiac chambers reflect their different functions?
What will be an ideal response?
Blood circulation is driven by contracting ventricles; contraction of atria only helps fill ventricles. Atria need only generate enough force to squeeze blood into ventricles, so they have relatively thin walls. Ventricle walls are more thickly muscled because their contraction must generate enough pressure to propel blood through an entire cardiovascular circuit. The left ventricle, which pumps blood through the long systemic circuit, has thicker walls than the right ventricle, which pumps blood to the lungs and back.
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The random movement of molecules is referred to as:
A. transport. B. osmosis. C. diffusion. D. All of the answer options are correct.
Humoral immunity involves all the following except:
A) antibodies. B) antigens. C) NK cells. D) plasma cells.
Erik notices some mold growing on cheese that he kept in his refrigerator too long. His friend David tells him that mold is a decomposer. Which of the following best describes the role of decomposers in a food web?
A) Decomposers eat other living organisms for nutrients and energy. B) Decomposers absorb water from the ground and use it to create energy that can be used by the organism. C) Decomposers absorb sunlight and use it to produce their own food. D) Decomposers breakdown and absorb nutrients from decaying matter
Which of the following statements regarding photosynthesis is false?
A) Photosynthesis consumes CO2; respiration consumes O2. B) The principal electron carrier in photosynthesis is NADPH; the principal electron carrier in respiration is NADH. C) Photosynthesis produces O2; respiration produces CO2. D) Photosynthesis is ultimately powered by light energy and respiration by the chemical energy of fuel molecules. E) ATP is not produced during photosynthesis, but only during respiration.