Most of the time, the parallel thick and thin filaments of the myofibrils are connected by ________ that span the space between myosin and actin molecules.
A) crossbridges
B) calcium ions
C) tropomyosin molecules
D) sarcomeres
E) nebulin molecules
A) crossbridges
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"Normal" body temperature may vary slightly as a result of
a. exercise. b. the menstrual cycle. c. the time of day. d. exposure to extremes in environmental temperature. e. all of these answers.
A dust particle floating on a water surface illustrates
A) surface tension. B) chemical tension. C) static electricity. D) heat capacity. E) hydrophilic attraction.
Name the structural components of a typical neuron
A) cell body, cilia, and a basement membrane B) neurofilaments, neurofibrils, and axolemma C) neurilemma, neurofibrils, and dendrites D) cell body, axon, and dendrites E) cell body, flagellum, and synaptic cleft
Which of the following statements is false regarding atrial systole?
A. The atria then repolarize and relax. B. The atria depolarize and contract together creating decreased volume and higher pressure in the atria than the ventricles. C. The increased pressure pushes blood through the AV valves into the atria. D. Blood rushes in from the vena cavae and pulmonary veins to fill the right and left atria.