True or False: The sarcoplasm is specially designed to conduct action potentials received from alpha motor neurons. O True O False
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It is not designed to conduct action potentials. Show more…
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Question 18 (1 point) An action potential arises when a neuron releases neurotransmitter into the synapse. True False Question 19 (1 point) Skeletal muscle is considered striated because of the arrangement of the myofibers into sarcomeres. True False Question 20 (1 point) One of the main differences between multicellular organisms and their protist ancestors was that only multicellular organisms have genes for proteins that permit the cells to bind to macromolecules in the environment. True False
Sukhwinder N.
true or false? "Golgi tendon organs help initiate action potentials when a muscle is contracted."
Supreeta N.
When the supply of ATP in a muscle (under physiological conditions) runs out, myosin heads remain detached from actin. True or false? Rank the following phases of a muscle twitch in the correct order: period of relaxation, period of contraction, and latent period. Match the description of the stimulus applied to a muscle fiber with the corresponding definition. a. subthreshold: not strong enough to produce a muscle twitch b. threshold: strong enough to produce a muscle twitch but no summation c. suprathreshold: stronger than necessary to cause summation When the sarcomere is at its normal resting length prior to stimulation, it will generate a very small contractile force. True or false? An increase in the frequency of action potentials leads to an increase in muscle force generated. True or false? When the overall amount of force in a muscle increases but muscle twitches are still visible in the force trace, this is known as incomplete tetanus. True or false? An increase in overall EMG amplitude typically corresponds to an increase in muscle tension. True or false? Tetrodotoxin, also known as "zombie powder," is synthesized by the puffer fish as a defense mechanism. Tetrodotoxin's mechanism of action is to block voltage-gated sodium (Na+) channels in motor neurons, thus preventing them from transmitting action potentials. This will render the muscle unable to contract due to a lack of stimulation. True or false? Which of the following best describes the role of ATP in cross bridge cycling? a. charges troponin so it exposes the myosin binding site of actin b. moves Ca2+ from the outside of the cell to the sarcoplasm in order to induce a contraction c. breaks the bond between actin and myosin and provides energy for resetting the myosin head d. powers the ATPase that returns the cell to a resting membrane potential
Madhur L.
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