Which one of the following statements is true with regard to Growth Hormone Secretion?

a. Growth hormone is secreted in a pulsatile pattern.

b. Growth hormone secretory rates are constant over a lifetime.

c. After puberty, the rate of growth hormone secretion declines to a stable level.

d. The highest rates of growth hormone secretion occur during puberty, and the lowest rates occur in senescence.

Which of the following is the correct combination of the statements given above?

#Question id: 10972

#Unit 7. System Physiology – Animal

What is the proper pathway for the extrinsic clotting pathway?

#Question id: 10973

#Unit 7. System Physiology – Animal

An 11-year-old premenstrual female presents with a painful knee after mild trauma. Upon further evaluation you observe soft tissue bruises. The child is an orphan and there is no family history. The foster mother reports no other problems. The aPTT is prolonged and the PT is normal. A complete hematologic workup would yield

#Question id: 10974

#Unit 7. System Physiology – Animal

A 63-year-old woman returned to work following a vacation in New Zealand. Several days after returning home, she awoke with swelling and pain in her right leg and her leg was blue. She went immediately to the emergency room where an examination showed an extensive deep vein thrombosis involving the femoral and iliac veins on the right side. Following resolution of the clot, this patient will require which treatment in the future?

#Question id: 10975

#Unit 7. System Physiology – Animal

A teenaged boy with numerous nosebleeds was referred to a physician for evaluation prior to a minor surgery. His prothrombin time (PT) was 11 sec (11–15 sec normal), partial thromboplastin time (PTT) was 58 sec (25–40 sec normal), and bleeding time was 6.5 min (2–7 min normal). Which of the following is most likely abnormal in this young man?

#Question id: 10976

#Unit 7. System Physiology – Animal

In a resting adult, the typical ventricular ejection fraction has what value?

#Question id: 10977

#Unit 7. System Physiology – Animal

A 60-year-old man’s EKG shows that he has an R-R interval of 0.55 sec. Which of the following best explains his condition?