The velocity of blood flow is the lowest in capillaries because _____
A) the capillaries have internal valves that slow the flow of blood
B) the diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate
C) the systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle
D) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system
D
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Algae can reproduce both sexually and asexually
Indicate whether the statement is true or false
The three main energetic components of sunlight are
A. gamma rays, visible light, and infrared radiation. B. visible light, radio waves, and ultraviolet radiation. C. ultraviolet radiation, visible light, and x-rays. D. ultraviolet radiation, visible light, and infrared radiation. E. microwaves, visible light, and ultraviolet radiation.
Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in alveoli?
A) 100 mm Hg B) 80 mm Hg C) 46 mm Hg D) 40 mm Hg E) 160 mm Hg
Gene testing allows the parents to learn more about their child in the prenatal period. However, there are genetic disorders, such as Huntington's disease, that show no phenotypic signs until age 35. This disease is caused by a dominant allele, resulting
in degeneration of the brain, muscle spasms, and death within a decade or two. Because it is caused by a dominant allele, 50% of the offspring will carry the disease. If you knew that someone in your family had Huntington's disease, would you get tested early on, before you start a family and have your own children? Would you rather not know your fate, even if it means that you may pass the dominant allele of this disease to your offspring? (Note: Before being tested, a person usually undergoes a battery of psychological tests to make sure that he or she is emotionally stable enough to deal with knowing that he or she will develop the disease and that there is no cure.) What will be an ideal response?