Which of the following scenarios will result in increased levels of tension in a muscle fiber: 1. Recruiting greater numbers of Type I motor units. 2. Lengthening the sarcomere so that few cross-bridges can form. 3. Evoking motor neuron action potentials in intervals of 200 msec. 4. Recruiting greater numbers of Type I motor units. 5. Recruiting Type IIB motor units.

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.