Which of the following is a correct statement?
a. Rhodopsin is active in the dark and thereby allows the release of neurotransmitters from
the synaptic terminal in the absence of light.
b. Rhodopsin is inactive in the dark and thereby inhibits the release of neurotransmitters from
the synaptic terminal unless light is present.
c. Rhodopsin is active in the dark and thereby inhibits the release of neurotransmitters from
the synaptic terminal in the absence of light.
d. Rhodopsin is inactive in the dark and thereby allows the release of neurotransmitters from
the synaptic terminal unless light is present.
e. Rhodopsin's activity is different between rods and cones, but leads always to increasing
amounts of neurotransmitters being release.
D
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You turn on the shower and check the water temperature with your hand. Your brain is able to monitor increasing temperature because the thermosensitive neurons in your skin
A. transmit action potentials to different brain regions as the water warms up. B. transmit bigger action potentials to the brain as the water warms up. C. gradually adapt to the stimulus. D. transmit action potentials at a greater rate when the water warms up. E. integrate temperature information.
Which of the following is a natural process of plants that can be used by humans to remove toxins from soils? Check all that apply.
_____ secretion of a substance from the roots that breaks down the toxic chemical _____ "storage" of a toxic chemical in plant tissues, which are then removed from the site _____ root pressure pushing toxins from deep in the soil towards the surface _____ physiological breakdown of the chemical into harmless products _____ transport of toxins absorbed by the roots into the shoots, where they can be collected more easily
When is the PO2 an especially strong stimulant of the respiratory control center in the brain of healthy individuals?
A. while running a road race along the shoreline of Vancouver B. while hyperventilating C. while climbing to the summit of Mt. Everest D. while hypoventilating E. while free-diving to a coral reef 60 feet below the surface of the sea
Which of the following is used during the
fight-or-flight response? a. sympathetic nervous system b. parasympathetic nervous system c. norepinephrine d. sympathetic nervous system and norepinephrine e. parasympathetic nervous system and norepinephrine