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BIO 1108 - Counter-current exchange in a colder environment...

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Counter-current exchange in a colder environment will: reduce heat loss Studying cell membrane at rest permeable to X and Y, positive. equilibrium potential X at +30mV, equilibrium Y at 70mV. Correct?: at a membrane potential of 0mV, both will leave cell (net flow) The sodium/potassium pump in neurons pumps: sodium out of cell and potassium in Heat exchange btw 2 bodies not direct contact: radiation Inhibitory post-synaptic potential (IPSP) can be caused by: opening of potassium channels on postsynaptic membrane All necessary for synaptic transmission except: neurotransmitters entering postsynaptic cell Ion channels on postsynaptic membranes are: voltage-gated channels Vasodilation under a hot shower will: increase heat gain Homeostatic regulation, Label #2: controlled condition Which of the following statements is correct regarding temporal summation: several action potentials arrive in fast succession at the same synapse Caught in blizzard. main effector organ that allows you to maintain stable body temp in situation: skin If could record activity of one of brain neurons right now with voltmeter, where would you expect to see graded potentials: axon hillock Among vertebrates we see evolutionary trend for increased maternal investment and protection of embryo. sequence: 2-3-4-1-5 (salamander, alligator, platypus, kangaroo, zebra) Most of action potentials in brian are transmitted from one neuron to next by: chemical signals Amniotic egg evolved btw amphibian and reptiles Marine iguanas on Galapagos island constrict blood vessels in skin: to cool off more slowly in water During action potential: sodium enters the cell followed by potassium leaving the cell Neurotransmitters are released from presynaptic axon terminals in synaptic cleft by: exocytosis "Early warning system" in temp regulation is based on all EXCEPT: the core temp does not change Homeostatic regulation, Label #4: set point
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Counter current arrangement for temperature regulation in tuna fish uses all EXCEPT: blood moves in the opposite direction of water Which vertebrates do not generally reproduce by internal fertilization: frogs Deer up North evolved to larger body size than Southern deer, mainly due to selection for: relatively less body heat being lost If you slow down the break-down of a neurotransmitter during synaptic transmission you would expect to see all of the following effects in the following effects in the postsynaptic neuron EXCEPT: the postsynaptic neuron is less likely to reach threshold Two frogs see a fly sitting on a rock at the same moment. The larger frog is twice as far from the fly as the smaller frog. To have a chance to get to the fly first the larger frog has to react faster than the smaller frog. Assuming that reaction speed is due to a difference in axon diameter the large frog compared to the small frog is they get to the fly at exactly the same time?: larger frog has 4 times axon diameter of the smaller frog
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