What are blood islands, and from which cells do they form?
A) Blood islands are primitive capillary networks formed from embryonic cells scattered within the yolk sac.
B) Blood islands are primitive arteries that are formed from hemangioblasts.
C) Blood islands are primitive veins that are formed from hemangioblasts.
D) Blood islands are aggregations of embryonic cells scattered within the yolk sac that form blood vessels and blood cells.
E) Blood islands are collections of blood cells that are formed from embryonic hematopoietic stem cells.
Answer: D
You might also like to view...
Adipose tissue is now considered an exocrine gland and is the smallest hormone-secreting tissue in the body
a. True b. False Indicate whether the statement is true or false
Which of the following combining forms means stone?
A. propri/o B. lith/o C. lacrim/o D. aur/o
Trace the path of a red blood cell from the renal artery to the glomerulus: (1) interlobar artery (2) interlobular artery (3) segmental artery (4) arcuate artery (5) afferent arteriole
A. 1, 2, 3, 4, 5 B. 1, 4, 2, 3, 5 C. 3, 1, 2, 4, 5 D. 2, 1, 3, 5, 4 E. 1, 4, 3, 2
If an animal cell lacked centrioles, it would not be able to
A) move. B) synthesize proteins. C) produce DNA. D) metabolize sugars. E) divide.