Describe the currents associated with EPSPs and IPSPs
What will be an ideal response?
At an excitatory synapse the binding of neurotransmitter to a receptor opens both Na+ and K+ channels. The electrochemical gradient favors the movement of Na+ into the cell, resulting in small depolarization or an EPSP. In an inhibitory synapse the binding of neurotransmitter to a receptor opens both K+ and Cl- channels. Cl- enters the cell, K+ leaves the cell, and the cell becomes hyperpolarized producing an IPSP.
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A. act as cushions between the vertebrae B. account for approximately 1/4 of the height of the spine C. are responsible for spinal movement due to compression D. all of the above are true
Compared with skeletal muscle, which of the following is not true of smooth muscle?
A. It has an ability to regenerate through mitosis. B. There are no Z discs. C. There are more T tubules. D. There are no striations. E. There is one nucleus per cell.
The tissue phagocytes, macrophages are derived from which agranulocyte?
a. neutrophils. b. eosinophils. c. basophils. d. lymphocytes. e. monocytes.
A cell has experienced a mutation that results in uncontrolled cell division. Which of the following types of defense cell would most likely interact with the mutated cell and how?
A. This is an antigen-presenting cell that interacts with the mutated cell through an MHC class I molecule. B. This is a cytotoxic T cell that interacts with the mutated cell through an MHC class I molecule. C. This is a cytotoxic T cell that interacts with the mutated cell through an MHC class II molecule. D. This is an antigen-presenting cell that interacts with the mutated cell through an MHC class II molecule.