Although the effects of an EPSP are subliminal, explain how EPSPs affect membrane potential. What will be an ideal response?
Concepts to Consider: EPSPs cause partial depolarization of the membrane. Repeated stimuli
propagate new EPSPs before previous ones have diminished. These can be added together
(summation) to bring the neuron to threshold level. Also, a neuron can be stimulated in more than one
place at one time when several synaptic terminals release neurotransmitters, which leads to
summation
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If a patient received a kidney transplant that was matched well across each of the major histocompatibility complex (MHC) molecules, but they stopped taking their anti-rejection drugs, what would happen and why?
A. Nothing-the transplant is matched, so the patient doesn't need the drugs to prevent rejection. The new organ should be seen by the recipient's immune system as "self." B. The organ will be rejected very quickly, as allografts (tissue from the same species, but a different individual) are seen by the recipient's immune system as "foreign," and are quickly attacked. C. The organ will be rejected, but it will be a gradual process since it was matched well. There are a number of other proteins that cannot be matched between donors, so the graft will still be viewed as "foreign" by the recipient's immune system, and will still be attacked. The attack will just be a slower and lengthier process. D. Nothing-since the transplant was accepted for so long with the anti-rejection drugs, the person's immune system has had the time to become accustomed to it and now views the graft as "self." It will not be attacked.
The extra-embryonic membrane that forms the
majority of the placenta is the a. amnion. b. allantois. c. chorion. d. yolk sac. e. umbilical cord.
The amphibian heart consists of two atria and two ventricle(s)
____________________ Indicate whether the statement is true or false.
Energy is defined as
A. the capacity to do work. B. change. C. movement. D. heat.