Which of the following statements regarding blood clotting is TRUE?
A. Blood clotting is enhanced by prostaglandin I2 (PGI2) and nitric oxide.
B. Injecting tissue plasminogen activator (t-PA) into a patient who is bleeding will aid blood clotting.
C. A blood clot is a network of interlacing strands of fibrinogen.
D. Blood clotting requires activation of thrombin.
E. Blood clotting occurs too rapidly in individuals with the disease hemophilia.
Answer: D
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Myofibrils are composed primarily of
A) fascia and tendons. B) troponin and tropomyosin. C) actin and myosin. D) perimysium and endomysium.
Haustral contractions ________
A) are powerful contractile waves B) propel food residue from the small intestine into the large intestine C) move food residue from one haustrum to the next haustrum within the large intestine D) occur three to four times daily E) propel food from the stomach into the small intestine
Which of the following produces the gonadotropic hormones?
A. Hypothalamus B. Anterior pituitary gland C. Testis D. All apply.
Which hormone does the kidney produce that stimulates red blood cell production?
a) thrombopoeitin b) vitamin D c) EPO d) renin