How does a four chambered heart allow for different blood pressure to exist in the pulmonary and systemic circuits? Why is this important?
What will be an ideal response?
A four-chambered heart has the advantage of allowing blood pressure to be regulated independently in each circuit. Strong contraction of the heart's left ventricle moves blood quickly through the lengthy systemic circuit. The right ventricle contracts more gently, protecting the delicate lung capillaries that would be damaged by higher pressure. The difference in ventricle contraction strength therefore controls the pressure needed to deliver blood to the extensive systemic circuit and the short, delicate pulmonary circuit.
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For which of the following diseases would animal models likely yield the most information?
a. alcoholism b. schizophrenia c. bipolar disorder d. Huntington disease e. nicotine addition
The blood circulatory system transports __________
percent of the absorbed ethanol to the liver. a. 10 b. 25 c. 50 d. 75 e. almost 100
Four of the five answers listed below are aspects of the scientific method. Select the exception
a. observation b. hypothesis c. experimentation d. philosophy e. conclusion
Mendel’s experiments with pea plants yielded useful results because
A. pea plants exhibit continuous variation. B. pea plants exhibit a variety of inheritance patterns. C. pea plants show discontinuous variation and complete dominance. D. pea plants are sterile. E. more than one of these are correct.