practicemt1_f07

practicemt1_f07 - Multiple Choice 1. Suppose a human...

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Multiple Choice 1. Suppose a human experienced a sudden increase in body temperature, which is a homeostatically regulated variable. Which of the following will most likely occur? a. The afferent directly stimulates sweat glands b. The set point will also increase c. The efferent pathway will activate the central integrator d. The effect will counter the change e. TWO of the above will most likely occur 2. In an experiment, you immerse a skeletal muscle cell into a solution containing half the amount of Na + compared to normal extracellular fluid. Compared to the normal system, what would be TRUE of the experimental system? a. The cell’s threshold will be more negative b. The Na + permeability will be halved. c. The resting membrane potential will become more electronegative. d. The equilibrium potential for Na + will be lower in magnitude e. The muscle cell cannot have an action potential 3. You’ve experimentally created a voltage-gated Na + channel that lacks an inactivation gate. What wll occur in neurons that contain this channel? a. The neuron will not exhibit refractoriness b. The resting membrane potential will be more positive than normal c. Sodium would not flux into the cell d. The voltage-gated K + channel will open later than normal e. The cell cannot be stimulated at high frequency 4. Pick the FALSE statement regarding myelination. a. Myelinated CNS neurons conduct action potential rapidly b. Demyelination diseases may affect central and peripheral neurons c. Action potentials spread via saltatory conduction d. Conduction velocity increases because myelination reduces internal resistance e. In most cases, the cell body of neurons is not myelinated 5. Which statement regarding the CSF is TRUE ? Cerebrospinal fluid = CSF Central nervous system = CNS a. The composition of CSF is identical to that of plasma b. The CSF is produced by the choroid plexus and directly bathes CNS neurons c. The CSF drains back into the blood at the blood brain barrier. d. Lipid soluble material easily diffuses from the plasma into CSF e. The CSF is produced by the blood brain barrier 6. You’re teaching your roommate about synapses. One fact you tell him is that. .. a. Neurotransmitters directly activate gap junctions b. Postsynaptic cells will sum IPSPs and EPSPs c. Ca 2+ -influx from the sarcoplasmic reticulum induces neurotransmitter release d. If an EPSP depolarizes the axon hillock sufficiently, an action potential is elicited in the presynaptic cell e. TWO of the above should be told to the roommate 7. Preganglionic autonomic neurons. ..
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a. Can have their cell bodies within the paravertebral ganglia b. Always release acetylcholine c. May innervate skeletal, smooth and cardiac muscles d. Have long axons in the sympathetic branch e. Carry afferent information from the spinal cord to target tissues. 8.
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practicemt1_f07 - Multiple Choice 1. Suppose a human...

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