Question

endocrine organs release their hormones:

a. into the blood stream to travel to the target organ
b. via ducts, directly to the target area
c. via the nervous system, directly to the target area
d. into the lymphatic system, to travel to the target organ

as an animal becomes sexually mature, the levels of sex hormones in the body such as oestrogen and testosterone:

a. disappear
b. stay the same
c. increase
d. decrease

Explanation:

Analyze endocrine hormone release mechanism

Endocrine glands are ductless glands that secrete hormones directly into the bloodstream to reach distant target organs. This distinguishes them from exocrine glands, which release secretions via ducts. Therefore, option (a) is correct for the first question.

Analyze sex hormone levels during sexual maturation

During puberty and sexual maturation, the gonads (ovaries and testes) are stimulated by gonadotropins to produce and secrete higher amounts of sex hormones like estrogen and testosterone. Therefore, these hormone levels increase, making option (c) correct for the second question.

Answer:

Question 1

• a. into the blood stream to travel to the target organ (Correct answer)
• b. via ducts, directly to the target area
• c. via the nervous system, directly to the target area
• d. into the lymphatic system, to travel to the target organ

Question 2

• a. disappear
• b. stay the same
• c. increase (Correct answer)
• d. decrease