A hospital patient produces 4 mL/min of urine with a urea concentration of 8 mg/mL. Venous blood draw reveals urea concentration of 0.4 mg/mL. What is the percentage of cleared urea from glomerular filtrate?
A. 80%
B. 40%
C. 56%
D. 64%
E. 72%
Answer: D
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Which of the following hormones is NOT secreted by the placenta during pregnancy?
A. human placental lactogen B. androgens C. estradiol D. progesterone E. inhibin
What is the connective tissue that surrounds the fascicle?
A. Endomysium B. Epimysium C. Perimysium D. Fascia
Which of the following does NOT affect the tension that can be developed by a muscle fiber?
a. the number of motor units recruited b. the frequency of action potentials conducted by the motor neuron c. the length of the fiber at the onset of contraction d. diameter of the muscle fiber e. All of these affect tension development by a muscle fiber.
Which is NOT an endocrine function performed by the liver?
A. Secreting insulin-like growth factor 1 B. Secreting angiotensinogen C. Secreting insulin D. Producing plasma proteins that bind hormones E. Clearing hormones from plasma