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Endocrine System and Hormones Quiz
Endocrine System and Hormones Quiz
Quiz
Question 1
Question 2
Question 3
Question 4
Question 5
Question 6
Question 7
Question 8
Question 9
Question 10
Question 11
Question 12
Question 13
Question 14
Question 15
Question 16
Question 17
Restart
What substance is secreted directly into the blood by specialised cells?
A.
A protein
B.
A hormone
C.
A vitamin
D.
A neurotransmitter
Check Answer