Ch. 43, 44 & Some Review
Supplemental Instruction
Iowa State University / Leader: / Lauren
Course: / BIOL 212
Instructor: / Kukday
Date: / 11/21/13
New material from this week (Ch. 43-44):
1. Does a photoreceptor cell utilize electrical or chemical synapses?
2. T/F photoreceptors are different from other sensory cells because hyperpolarization causes the action potentials that lead to the release of the neurotransmitter glutamate rather than depolarization.
3. In order for a photoreceptor (rod) cell to hyperpolarize, what ion channels must open/close?
4. What compound is responsible for the opening/closing of these channels?
5. What would happen if the gene that encodes troponin were mutated in such a way that it could no longer bind Ca2+?
Some Exam review (Ch. 38, 48, 41-43)
6. What is the role of the operculum? (General and role in buccal pumping)
7. Describe the flow of water with respect to blood flow in fish gills and explain why it is set up this way.
8. Do increased CO2 levels in the blood cause higher or lower Hb-O2 binding affinity? Explain why both molecularly and logically.
9. How is CO2 transported from the tissues to the lungs?
10. The cohesion-tension theory explains how transpiration moves water up through the plant. Would this work if oil was the plant’s vascular liquid rather than water?
11. T/F Glial cells line the dendrites, forming the myelin sheath.
12. You are performing an experiment on the axons of neurons in the presence of a certain toxin. You notice that the membrane depolarizes & fires an action potential like normal; however it continues to become more and more polarized (positive potential) and never begins to drop. Form a hypothesis of what the toxin may be affecting in the neurons.
13. What would happen if a drug blocked the opening of Ca2+ channels in the presynaptic cell?
14. Which part of the limbic system is most important for learning & memory?
15. T/F Short-term memory is established via the synthesis of new synaptic connections.