Visual accommodation involves the ability to ____
a. change the sensitivity of the rods and cones by means of neurotransmitters
b. change the position of the retina
c. change the thickness of the lens by contracting or relaxing certain muscles
d. protect the eyeball from foreign matter
e. prevent eye strain
ANSWER: c
You might also like to view...
Protective layers outside the bacterial cell membrane include:
a. cell walls only b. capsules only c. envelopes only d. cell walls and plasmids e. cell walls and capsules
Which of the following is part of the initial response to cold temperature?
a. vasodilation of peripheral blood vessels b. panting c. sweating d. shunting of the blood to the core regions of the body e. decreased metabolism
Sense receptors for “taste” are variously located
a. on insect legs. b. on octopus tentacles. c. on arthropod antennae. d. inside the mouth. e. in all of these places.
What is the animal in the accompanying figure?
a. mosasaur b. plesiosaur c. pterosaur d. thecodont e. ichthyosaur