The principal difference between endocrine glands and paracrine glands is that
a. paracrine glands are directly controlled by nerves.
b. paracrine glands secrete steroid hormones, and endocrine glands secrete peptide hormones.
c. endocrine glands act over a longer distance.
d. paracrine glands are larger and easier to remove surgically.
e. only the paracrine glands have a duct.
C; Paracrine glands are involved in signaling over short distances. These glands generally respond to local chemical signals (choice a), produce peptide signals (choice b), and are often composed of single cells or small groups of cells (choice d), secreting molecules directly into the extracellular fluid (choice e).
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During conscious quiet rest, the brain is emitting
a. alpha waves. b. beta waves. c. delta waves. d. gamma waves. e. rapid, irregular waves.
The male gametophyte becomes
a. ovules. b. seeds. c. pollen grains. d. cones. e. sperm cells.
this image shows a sagittal section of the male reproductive system. What does 4 represent
What will be an ideal response?
Biochemical tests are no longer very important for the identification of enteric bacteria.
Answer the following statement true (T) or false (F)