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Mcphs Bio II Final Exam With Complete Solutions
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Mcphs Bio II Final Exam With Complete Solutions
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Mcphs Bio II Final Exam With CompleteSolutions
chambers called ____ and _____ allow humans to perceive position with respect to gravity or
linear movement Correct Ans-utricle, saccule
sensory cells that contain light absorbing pigment molecules Correct Ans-photoreceptors
transduction of visual information in the nervous system begins with ______ conversion
Correct Ans-light induced
in bright light, _____ remains active and rods become saturated; if light abruptly decreases, rods
are not fully responsible for several minutes (blinded briefly when passing from bright to dark)
Correct Ans-rhodopsin
processing of visual information begins in the ____ Correct Ans-retina
when light strikes rods and cones, they _______, shutting off their release of ______ Correct
Ans-hyperpolarize; glutamate
________ cell axons form optic nerves that transmit action potentials from the eyes to the brain
Correct Ans-ganglionic
,two optic nerves meet at the optic _____ near the cerebral cortex base and sensations from the
right visual field are transmitted to the left side of the brain and vice versa Correct Ans-
chiasma
human color perception is based on three cone types: Correct Ans-red, green, blue
when the human eye focuses on a close object, the lens becomes ______, when it focuses on a
distant object, it ______ Correct Ans-spherical, flattens
center of visual field where there are no rods but high density of cones Correct Ans-fovea
gustation Correct Ans-taste
olfaction Correct Ans-smell
thin filaments are composed primarily of Correct Ans-actin
thick filaments are staggered arrays of Correct Ans-myosin
muscle contraction occurs when filament movement is powered by _______ energy Correct
Ans-chemical
, bundles of thick and thin filaments that surround each muscle fiber nuclei Correct Ans-
myofibrils
repeating sections of myofibrils, borders of sarcomeres line up forming patterns of light and dark
bands (striations) Correct Ans-sarcomeres
sliding filament model of muscle contraction says that as contracting muscle shorters, the
filaments that bring about the contraction.. Correct Ans-stay the same length
thin and thick filaments ratchet past each other, powered by _____ molecules Correct Ans-
myosin
myosin head is bound to ATP in a low energy configuration: it hydrolyzes ___ to _____
Correct Ans-ATP, ADP
myosin binds to ____, forming a cross bridge with thin filament Correct Ans-actin
myosin then pulls ____ filament toward center of sarcomere, returning to low energy form
Correct Ans-thin
when a new ATP binds to myosin head, cross bridge is disrupted, releasing ______ head from
actin Correct Ans-myosin
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