The extracellular matrix of cartilage, unlike that of most connective tissues, has unusually abun-dant molecules of:
a. Keratin
b. Type I collagen
c. Type III collagen
d. Type IV collagen
e. Water
ANS: E
The highly charged proteoglycans of cartilage, present in association with type II collagen, be-come associated with numerous water molecules that give cartilage its resilience and stiffness.
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Which of the following statements concerning peptide hormones is incorrect?
a. Peptides are synthesized by the endoplasmic reticulum-Golgi complex system. b. Peptides circulate largely bound to plasma proteins. c. Peptides bind to surface receptors of their target cells. d. Peptides exert their effect largely by means of second-messenger systems. e. Peptides are released by exocytosis upon appropriate stimulation.
Adipocytes secrete messengers called adipokines one of which is adiponectin
Indicate whether the statement is true or false
RhoGam injections are given to
A. desensitize the fetus. B. activate fetal Rh antigens. C. protect the father. D. prevent sensitization of the mother. E. change the mother's blood type.
Distributing arteries
A. contain a lot of elastic tissue. B. contain a thick tunica media. C. are strong, rigid vessels. D. transport blood from arterioles to capillaries. E. do not contain smooth muscle in their walls.