Identify the item that does not enter a cell through a coated pit:
a. insulin
b. iron
c. cholesterol
d. vitamin B12
e. cargo protein
E
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If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be ________.
A. fatigue B. complete tetanus C. incomplete tetanus D. spasm E. flaccid paralysis
Sudden infant death syndrome (SIDS), also known as crib death, occurs more often when babies sleep on their stomach.
Answer the following statement true (T) or false (F)
A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 5 millimolar. What is the best explanation for this observation?
A. X is moving into the cell by simple diffusion. B. X is moving into the cell by diffusion through a protein channel. C. X is moving into the cell by facilitated diffusion. D. X is moving into the cell by primary active transport. E. Water is leaving the cell by osmosis.
A burn affecting only the epidermis is a
A. second-degree burn. B. third-degree burn. C. deep partial-thickness burn. D. superficial partial-thickness burn.