Jawless fish lack immunoglobulins and use __________________ to recognize non-self macromolecules
A) Variable antigen receptors
B) Variable lymphocyte receptors
C) C region receptors
D) Recombination signal receptors
Fill in the blank with the correct answer.
Answer: B
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In which direction does carbon dioxide move during internal respiration?
A) from the blood into the tissue cells B) from the blood into the lungs C) from the lungs into the atmosphere D) from the tissue cells into the blood E) from the lungs into the blood
Which vessel in the diagram is the interlobular artery?
a) D b) E c) F d) L
Repolarization begins as:
A) voltage-gated potassium ion channels activate. B) voltage-gated sodium ion channels activate. C) voltage-gated potassium ion channels begin to close. D) sodium ions follow their electrochemical gradient into the cell.
Which tunic of the GI tract is vascular and has many nerves and glands?
A. Serosa B. Muscularis C. Mucosa D. Submucosa