Which of the following changes would most increase the resistance to blood flow in a blood vessel?
A. Decreasing the hematocrit from 50% to 40%
B. Doubling the length of the vessel
C. Halving the diameter of the vessel
D. Doubling the diameter of the vessel
E. Halving the length of the vessel
Answer: C
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Which part of the renal tubular system reabsorbs or secretes the most substances?
A. Distal tubule B. Collecting duct C. Proximal tubule D. Descending loop
This figure shows the os coxa. Which of these statements about the figure is correct?
A. The figure shows a right bone, and number 1 indicates the anterior superior iliac spine. B. The figure shows a right bone, and number 3 indicates the greater sciatic notch. C. The figure shows a right bone, and number 8 indicates the ischial spine. D. The figure shows a left bone and number 7 indicates the obturator foramen. E. The figure shows a left bone, and number 6 indicates the ischial tuberosity.
The ________ is the inner lining of the uterus
A) perimetrium B) myometrium C) germinal epithelium D) uterine lumen E) endometrium
The viscosity of blood is due more to the presence of ________ than to any other factor
A) erythrocytes B) fibrin C) nitrogenous wastes D) sodium E) albumin