How does estradiol increase the likelihood that an egg will be fertilized?
A. It inhibits the motility of uterine smooth muscle.
B. It stimulates inhibin levels, which causes a surge of FSH.
C. It changes cervical mucus to a watery consistency that allows sperm to penetrate the cervix.
D. It stimulates LH receptors that help maintain a corpus luteum.
E. It increases libido, or sex drive, in women.
Answer: C
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In a redox reaction, when one reactant is oxidized, the other
A. is reduced. B. is also oxidized. C. is hydrolyzed into a smaller molecule. D. releases chemical energy in the form of ATP. E. becomes a larger, more complex molecule.
Match each of the terms with its definition or description.
a. digestion b. absorption c. amylase d. bile e. maltase f. lipase g. pepsin h. monosaccharides i. glycerol j. amino acids k. mastication l. lactase m. hydrochloric acid n. trypsin o. deglutition p. sucrase 1. _____ Causes the emulsification of fats 2. _____ Enzyme that reduces complex carbohydrates to maltose 3. _____ This and fatty acids are the end products of fat digestion 4. _____ Enzyme that converts maltose to simple sugars 5. _____ Enzyme that is responsible for the chemical digestion of fats 6. _____ Movement of digested food from the digestive system to the blood or lymph 7. _____ End product of carbohydrate digestion 8. _____ A protein enzyme that must be activated by hydrochloric acid in the stomach 9. _____ End product of protein digestion 10. _____ Physical and chemical changes in food that prepare it for movement into the blood or lymph 11. _____ Another word for swallowing 12. _____ Enzyme that digests cane sugar 13. _____ Substance needed to convert pepsinogen to pepsin 14. _____ Another word for chewing 15. _____ Protein-digesting enzyme in pancreatic juice 16. _____ Enzyme that digests milk sugar
The layer of a blood vessel wall that determines the diameter of the lumen is the:
A. Tunica media B. Tunica externa C. Tunica interna
Match the term with its description:
1. the desired target value for a parameter 2. receives information about the regulated variable and initiates a response 3. the minimum stimulus to trigger a response 4. the organ or gland that performs the change 5. continuously monitors its environment for a specific variable A. threshold B. effector C. integrating center D. setpoint E. sensory receptor