Each villus contains a lacteal, which functions to:
a. absorb the products of lipid digestion.
b. aid in the absorption of carbohydrates.
c. aid in the absorption of water.
d. secrete enzymes to aid in the absorption of fats.
e. remove protein from the interstitial fluid.
a
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Which of the following is used to help protect the lungs from infection?
A. The mucociliary escalator moves trapped organisms away from the lungs by ciliary action. B. Coughing and sneezing forcefully expel organisms away from the lungs. C. Turbulent airflow deposits airborne pathogens on sticky mucosal surfaces. D. All of the choices are correct.
__ stimulates the descent of the testes
Fill in the blank(s) with the appropriate word(s).
Homeotic genes generally control _________________.
A. X chromosome inactivation B. the formation of a specific body part C. hormone synthesis. D. dosage compensation E. DNA methylation.
What plant secondary metabolite was isolated from the Cinchona tree to fight malaria?
A. taxol B. penicillin C. digitalis D. acacia E. quinine