Which of the following is not a component of the portal triad found at the edges of a liver lobule?
A) hepatic artery
B) bile duct
C) central vein
D) hepatic portal vein
E) None of the answers is correct; all are present in the portal triad.
Answer: C
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a. supplies enzymes to break down the covering of the ovum b. contains mitochondria c. holds 23 chromosomes d. is a whip-like structure that provides movement for the sperm
Which of the following factors keeps the alveoli expanded?
A. Negative intra-alveolar pressure B. Alveolar pressure being equal to atmospheric pressure C. A reduction in surfactant D. A pneumothorax E. Negative pleural pressure
Which statement about the pectoral girdle is false?
A) It attaches the upper limb to the axial skeleton. B) It is light and has no posterior attachment to the axial skeleton. C) Its bones provide for great range of motion. D) Its bones attach to each other and to the axial skeleton.
Cellular membrane potential is measured in
A) milliseconds. B) micrometers. C) Hertz. D) millivolts. E) amperes.