If you yell "boo" as you jump from behind a door and scare your friend, your friend turns pale because what constricts?

A. veins
B. capillaries
C. venules
D. arterioles
E. arteries


Answer: D. arterioles

Biology & Microbiology

You might also like to view...

A high concentration of H+ in the thylakoid

compartment provides potential energy for the ____ by____. a. breakdown of water; oxidation b. production of ATP; ATP synthesis c. reduction of NADP+; an electron transfer chain d. production of sugars; the light-independent reactions e. production of O2; photolysis

Biology & Microbiology

In pedigrees, a male individual is symbolized as a ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

What is the cause of Tay—Sachs disease?

What will be an ideal response?

Biology & Microbiology

Amphibians’ history include all of the following EXCEPT:a

underwent an adaptive radiation during the Carboniferous period. b. inhabited both aquatic and terrestrial ecosystems. c. are thought to have descended from lungfish during the late Devonian period. d. were the dominant terrestrial carnivores of the Carboniferous period. e. appeared for the first time in the Silurian period

Biology & Microbiology