Study Qs – Physiology
Selected Questions from Campbell & Reece, Biology (8e)
Concept Check: 40.1 (3), 40.2 (1, 2)
End of Chapter: 7
Concept Check: 45.1, 45.2, 45.3
End of Chapter: 1, 2, 3, 5, 7
Concept Check: 48.1, 48.2, 48.3 (1, 2), 48.4,
End of Chapter: 1 - 10
Concept Check: 50.1, 50.2
End of Chapter: 1, 2, 3, 5, 6
1. Poor Dr. Westwood took a vacation in Australia to recuperate from his experiences
with the pufferfish and the pitohui.
While snorkeling near the Great Barrier Reef, he
began to feel an uncomfortable numbness and paralysis. It’s possible that he was stung by
a cone snail and injected with Conotoxin, which blocks voltage-gated calcium channels
Describe one way
in which this toxin could cause Dr. Westwood’s paralysis.
2. The figure below shows an experimental setup with two neurons and a muscle cell.
You have inserted a stimulating electrode with which you can depolarize neuron 1.
also have inserted 3 voltage recording electrodes with which you can measure membrane
potential in the first neuron (electrode A), in the second neuron (electrode B) and in the
muscle cell itself (electrode C).
Under control conditions a stimulation causes the muscle
cell to contract. For each of the conditions listed below, indicate what you would expect