The contractile activity of smooth muscle cells within which type of blood vessel is primarily involved in the control of the organ blood flow and mean arterial pressure?
A) veins
B) capillaries
C) arterioles
D) venules
E) arteries
Answer: C) arterioles
You might also like to view...
Approximately what percent of the total number of plant species have had their genomes partially or
fully sequenced?
a. 0.01% d. 10% b. 0.10% e. 50% c. 1%
The most immediate source of energy for reformation of ATP in muscle cells is
a. aerobic respiration. b. mitochondrial pathways. c. electron transport phosphorylation. d. creatine phosphate. e. anaerobic fermentation.
Cells are _____
A) only found in pairs, because single cells cannot exist independently B) limited in size to 200 and 500 micrometers in diameter C) characteristic of eukaryotic but not prokaryotic organisms D) characteristic of prokaryotic and eukaryotic organisms
The sexual reproduction of earthworms characteristically is
A. normal appearing, but individuals change sex periodically. B. hermaphroditic but cross-fertilizing. C. hermaphroditic but self-fertilizing. D. normal type between individuals who remain as males and females throughout their lifetime. E. normal appearing, but individuals reproduce only once in their lives.