Which of the following vessels carry blood from your brain to your heart?
a) hepatic vein
b) carotid artery
c) jugular vein
d) coronary vein
e) renal vein
Ans: c) jugular vein
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Virulent pathogens are
A. more likely to cause disease. B. more likely to cause severe disease. C. unable to cause disease. D. more likely to be opportunists.
Sperm require lots of energy and this is generated by mitochondria located within the _______________
Fill in the blank(s) with the appropriate word(s)
Molecules that permeate a plasma membrane by facilitated diffusion
A) do so much more quickly than those crossing by simple diffusion. B) require the aid of transport proteins. C) require energy. D) move from an area of low concentration to an area of high concentration.
What is the route of water in the water vascular system of a starfish?
A. Water enters the ampullae and then goes to the tube feet and from thence to the radial canals, then the ring canal, and finally exits through the madreporite. B. Water enters the madreporite into the radial canals and from thence into the ring canal, then the ampullae and finally into the tube feet. C. Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet. D. Water enters the ring canal, then goes into the radial canals, and finally through the madreporite to the ampullae and tube feet. E. Water enters the madreporite into the ampullae and from thence into the ring canal, then the radial canals to the ampullae and finally into the tube feet.