[Campbell Biology P.1053] Which of the following statements best describes the primary differ... | Practice Question
Which of the following statements best describes the primary difference between endocrine and exocrine glands?
A: Endocrine glands secrete substances into ducts, while exocrine glands secrete directly into the bloodstream.
B: Endocrine glands secrete hormones directly into the surrounding fluid, while exocrine glands secrete substances through ducts onto surfaces or into cavities.
C: Endocrine glands only secrete hormones, while exocrine glands secrete enzymes.
D: Endocrine glands are found only in males, while exocrine glands are found only in females.
Explanation
The text on page 1004 clearly states: 'Note that endocrine glands secrete hormones directly into the surrounding fluid. In contrast, exocrine glands have ducts that carry secreted substances, such as sweat or saliva, onto body surfaces or into body cavities.'