The repeating unit of a skeletal muscle fiber is the (z line to z line)

31. Humans can smell as many as 10,000 different odors but have significantly fewer types of olfactory receptors. Which of the following is the best explanation for why humans can distinguish so many smells?        

20.  Injury to the hypothalamus may result in all of the following EXCEPT ________.        

43.The blind spot of the eye is caused by ________.  

47. The optic disc forms a blind spot where the optic nerve leaves the eyeball.

33.  What is the main function of the rods in the eye?        

22. What is the portion of the cell cycle during which the chromosomes are invisible under the light microscope because they are not yet condensed?  

Samantha and Emily visited the International House of Pancakes for breakfast during their road trip to Chicago last summer. The two friends often joke about the waiter who kept folding their napkins into animal shapes when either of them left the table. Every time Emily sees an IHOP, she thinks of her road trip with Samantha. What type of memory is Emily using when she experiences these periodic flashbacks?

40.  Taste buds are NOT found ________.        

34. At what checkpoint(s) does the cell arrest in response to DNA damage?