Which hormones use second-messenger systems?
a. proteins
b. catecholamines
c. steroids
d. thyroid hormone
e. Both c and d
B
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Which is not correct regarding growth hormone (GH)?
A. GH affects most body cells. B. GH stimulates the kidney to secrete somatomedin. C. GH is a tropic hormone. D. GH is also known as somatotropin. E. GH stimulates cell growth and mitosis.
Three main classes of diuretic hormones have been identified in insects. Which of the following is NOT one of those classes?
A) CRF-related diuretic hormones B) Insect myokinins C) Corticotrophin-releasing factors D) Cardioacceleratory peptides
The place where the optic nerve exits the eye is the
A. fovea. B. blind spot. C. ciliary body. D. lens.
Endomysium is a delicate network of loose connective tissue that
A. surrounds each muscle fiber. B. forms a sheath around a fasciculus. C. is composed of elastic fibers. D. separates individual muscles. E. penetrates muscle fibers.