Which of the following is true about hemoglobin?
A. appears red in color when depleted of O2
B. binds O2 210x more strongly than it binds carbon monoxide
C. content tends to be higher in the blood of young women than young men
D. erythropoietin inhibits synthesis
E. heme centers reversibly bind O2
Ans: E. heme centers reversibly bind O2
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The total refractory period of cardiac muscle _____
A) is about the same as the total refractory period for skeletal muscle B) is shorter than the total refractory period for skeletal muscle C) is longer than the contraction of cardiac muscle D) is longer than the total refractory period for skeletal muscle
An articular capsule is present in
A. synovial joints. B. fibrous joints and synovial joints. C. fibrous joints and cartilaginous joints. D. all joints. E. fibrous joints.
What is the function of histamine?
A. It is a vasodilator that speeds blood flow to injured tissues. B. It is a chemical that kills bacteria. C. It is a clotting factor. D. It is a signal to B cells to produce antibodies. E. It is an anticoagulant that inhibits blood clotting.
Which of the following is a remnant of the fetal umbilical vein?
A) round ligament B) greater omentum C) mesentery proper D) lesser omentum E) diaphragm