Socrative Bio 210 Practice Questions and Correct Answers

Socrative Bio 210 Practice Questions and Correct Answers "Staircase" and "warm up" are alternative names for ___________, an increased muscle response to a constant stimulus. ✅treppe The are found at the initial segment and conductive segment of the neuron. a. voltage -gated Ca++ channel b. voltage -gated K+ channel c. chemically gated K+ channel d. chemically gated Cl - channel e. voltage -gated Na+ channel ✅b and e Which of the following statements about depolarization is false? ✅depolarization results in more negative membrane potential Which sequence correctly lists the changes that allow the thick and thin filaments to slide past one another in skeletal muscle contraction? ✅Attach - pivot - detach - return The narrow space that separates the motor neuron and the skeletal muscle fiber in a neuromuscular junction is called the: ✅synaptic cleft These structural characteristics apply to cardiac muscle: ✅single, centrally located nucleus striated Waves of contraction traverse an entire sheet of visceral smooth muscle due to the numerous gap junctions that allow action potentials to pass directly from cell to cell. ✅True Which functional area of the neuron propagates the action potential? a. receptive segment b. initial segment c. conductive segment d. transmissive segment ✅conductive segment Which substances are more prevalent in the cytosol? a. Na+ b. K+ c. Ca++ d. Cl- e. P- ✅b and e Incomplete tetanus occurs when action potentials are produced so rapidly that the muscle completely contracts without any relaxation. TRUE OR FALSE ✅false In general, fast twitch fibers generate less power than slow twitch fibers. TRUE OR FALSE ✅false The type of fibers specialized to continue contracting for extended periods of time, as would be required in running a marathon, for example, are _____ fibers. ✅slow fibers These statements about creatine phosphate are true except: ✅supports intense exercise for up to 3 minutes What type of propagation would this neuron use based on its structural features? ✅saltatory propagation The is found at the transmissive (secretory) segment of the neuron. a. Na+/ K+ exchange pump b. voltage -gated channel c. mechanically gated channel d. Ca++ pump e. chemically gated K+ channel ✅b and d Choose all of the following statements that are correct for local (graded) potentials a. may be hyperpolarization potentials b. may be depolarization potentials c. are due to opening of chemically gated channels d. lose strength further away from stimulus e. are short -lived ✅a,b,c,d,e When you attempt to shovel a load of snow that is too heavy, what sort of muscle contraction are you using? ✅isometric contraction This statement best describes the muscle property of extensibility: ✅muscles can stretch when needed What is the resting membrane potential value? ✅-70mV Which muscle fiber type primarily composes muscles that maintain posture? ✅Slow oxidative fibers Which of the following statements about repolarization is correct? a. repolarization occurs when the membrane potential changes from +30 mV to -70 mV b. repolarization occurs when the membrane potential changes from -70 mV to -90 mV