A human red blood cell in an artery of the left arm is on its way to deliver oxygen to a cell in the thumb. To travel from the artery to the thumb and then back to the left ventricle, this red blood cell must pass through _____
A) one capillary bed
B) two capillary beds
C) three capillary beds
D) four capillary beds
B
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Why are sea squirts and lancelets referred to as invertebrate chordates?
What will be an ideal response?
Comb-jellies are similar to bilaterians in that they (select all that apply):
A. have a "flow-through" gut with both a mouth and an anus. B. develop muscle cells from a rudimentary mesoderm. C. have an anterior-posterior body axis. D. use acetylcholine as a neurotransmitter. E. none of these.
Borrelia burgdorferi is a spirochete with a number of axial filaments
Indicate whether this statement is TRUE or FALSE.
Cells
A. are more complex than tissues. B. are the first level of organization in the body. C. are the smallest living units of structure and function in the body. D. both B and C.