Of the three regions of a human kidney, which is the innermost layer?
A) Renal pelvis
B) Renal medulla
C) Renal cortex
D) Calyx
Answer: A) Renal pelvis
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Which of the following statements is false?
a. Tobacco smoking is the most serious risk factor for cardiovascular disease. b. Until age 50, males have a greater risk of a heart attack than females. c. Hypertension is called the silent killer. d. In atherosclerosis, the diameter of the lumen of a blood vessel decreases. e. If a blood clot becomes dislodged and travels in the bloodstream, it is called a thrombus.
In the description of homeostasis, the term dynamic constancy refers to
A) a disregarded theory that suggested there were no external energy requirements to maintain cell homeostasis. B) a constant movement toward equilibrium. C) the direct interaction of each positive feedback system with its corresponding negative feedback system. D) the use of ATP to initiate a cascade effect. E) the fact that even though physical and chemical changes do occur, conditions are kept within a range.
External respiration
a. moves carbon dioxide from alveoli into the blood. b. moves oxygen from alveoli into the blood. c. moves oxygen from the blood into alveoli and carbon dioxide in the opposite direction. d. moves oxygen from alveoli into the blood and carbon dioxide in the opposite direction. e. moves both oxygen and carbon dioxide from alveoli into the blood.
Phenotypically wild-type F1 female Drosophila, whose mothers had light eyes (lt) and fathers had straw (stw) bristles, produced the following offspring when crossed to homozygous light-straw males:
Phenotype Number light-straw 22 wild-type 18 light 990 straw 970 Total: 2000 Compute the map distance between the light and straw loci.