The basis for muscle contraction is
a. rotation of myosin fibers around actin fibers.
b. expansion of the sarcomere.
c. the sliding of myosin and actin fibers past one another.
d. movement of the Z discs away from one another.
Ans: c. the sliding of myosin and actin fibers past one another.
You might also like to view...
Animals are classified according to all of the following features EXCEPT
A. type of body symmetry. B. mode of reproduction. C. presence or absence of segmentation. D. molecular data. E. number of germ layers.
At the synapse, some neurotransmitters open ion channels that make the interior of the postsynaptic neuron more negative. Thus, these neurotransmitters produce a(n) ________ postsynaptic potential (IPSP)
A) enhancing B) decreasing C) excitatory D) inhibitory E) rewarding
Oxygen has an atomic mass of 16 and an atomic number of 8. How many neutrons are present?
A. 4 B. 24 C. 16 D. 8
Which of these is not a form of kinetic energy?
A) a cyclist pushing the pedals of a bike B) a condor flapping its wings C) a ball rolling down a hill D) a covalent bond linking phosphate molecules E) a runner, sprinting toward the finish line